15974142520 has 128 divisors (see below), whose sum is σ = 42504744960. Its totient is φ = 5287265280.

The previous prime is 15974142493. The next prime is 15974142539. The reversal of 15974142520 is 2524147951.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3964747 + ... + 3968773.

It is an arithmetic number, because the mean of its divisors is an integer number (332068320).

Almost surely, 2^15974142520 is an apocalyptic number.

15974142520 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 15974142520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21252372480).

15974142520 is an abundant number, since it is smaller than the sum of its proper divisors (26530602440).

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

15974142520 is a wasteful number, since it uses less digits than its factorization.

15974142520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4533 (or 4529 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 15974142520 in words is "fifteen billion, nine hundred seventy-four million, one hundred forty-two thousand, five hundred twenty".