15961720490016 has 192 divisors, whose sum is σ = 50814028339200. Its totient is φ = 4288273330176.

The previous prime is 15961720489931. The next prime is 15961720490017. The reversal of 15961720490016 is 61009402716951.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (15961720490017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7839961 + ... + 9663768.

It is an arithmetic number, because the mean of its divisors is an integer number (264656397600).

Almost surely, 2^{15961720490016} is an apocalyptic number.

15961720490016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15961720490016 is an abundant number, since it is smaller than the sum of its proper divisors (34852307849184).

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

15961720490016 is a wasteful number, since it uses less digits than its factorization.

15961720490016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17503831 (or 17503823 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 15961720490016 in words is "fifteen trillion, nine hundred sixty-one billion, seven hundred twenty million, four hundred ninety thousand, sixteen".