1215525123140 has 12 divisors (see below), whose sum is σ = 2552602758636. Its totient is φ = 486210049248.

The previous prime is 1215525123103. The next prime is 1215525123149. The reversal of 1215525123140 is 413215255121.

It can be written as a sum of positive squares in 2 ways, for example, as 699337477696 + 516187645444 = 836264^2 + 718462^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1215525123097 and 1215525123106.

It is not an unprimeable number, because it can be changed into a prime (1215525123149) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 30388128059 + ... + 30388128098.

It is an arithmetic number, because the mean of its divisors is an integer number (212716896553).

Almost surely, 2^{1215525123140} is an apocalyptic number.

1215525123140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215525123140 is an abundant number, since it is smaller than the sum of its proper divisors (1337077635496).

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

1215525123140 is a wasteful number, since it uses less digits than its factorization.

1215525123140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60776256166 (or 60776256164 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 1215525123140 in words is "one trillion, two hundred fifteen billion, five hundred twenty-five million, one hundred twenty-three thousand, one hundred forty".