15961485696 has 128 divisors (see below), whose sum is σ = 45711993600. Its totient is φ = 4905535488.

The previous prime is 15961485599. The next prime is 15961485721. The reversal of 15961485696 is 69658416951.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×15961485696² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6822895 + ... + 6825233.

It is an arithmetic number, because the mean of its divisors is an integer number (357124950).

Almost surely, 2^15961485696 is an apocalyptic number.

15961485696 is a gapful number since it is divisible by the number (16) 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 15961485696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22855996800).

15961485696 is an abundant number, since it is smaller than the sum of its proper divisors (29750507904).

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

15961485696 is a wasteful number, since it uses less digits than its factorization.

15961485696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736 (or 3724 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 60.

The spelling of 15961485696 in words is "fifteen billion, nine hundred sixty-one million, four hundred eighty-five thousand, six hundred ninety-six".