145520212520 has 64 divisors (see below), whose sum is σ = 335013624000. Its totient is φ = 56870304768.

The previous prime is 145520212459. The next prime is 145520212543. The reversal of 145520212520 is 25212025541.

It is a happy number.

It is a super-2 number, since 2×145520212520² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195536 + ... + 573824.

It is an arithmetic number, because the mean of its divisors is an integer number (5234587875).

Almost surely, 2^145520212520 is an apocalyptic number.

145520212520 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 145520212520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167506812000).

145520212520 is an abundant number, since it is smaller than the sum of its proper divisors (189493411480).

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

145520212520 is a wasteful number, since it uses less digits than its factorization.

145520212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378522 (or 378518 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 145520212520 in words is "one hundred forty-five billion, five hundred twenty million, two hundred twelve thousand, five hundred twenty".