125815210021480 has 128 divisors (see below), whose sum is σ = 326903560462080. Its totient is φ = 42686263664640.

The previous prime is 125815210021439. The next prime is 125815210021489. The reversal of 125815210021480 is 84120012518521.

It is a super-2 number, since 2×125815210021480² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (125815210021489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206682439 + ... + 207290281.

It is an arithmetic number, because the mean of its divisors is an integer number (2553934066110).

Almost surely, 2^{125815210021480} is an apocalyptic number.

125815210021480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125815210021480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163451780231040).

125815210021480 is an abundant number, since it is smaller than the sum of its proper divisors (201088350440600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125815210021480 is a wasteful number, since it uses less digits than its factorization.

125815210021480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615579 (or 615575 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 40.

The spelling of 125815210021480 in words is "one hundred twenty-five trillion, eight hundred fifteen billion, two hundred ten million, twenty-one thousand, four hundred eighty".