15665063540 has 24 divisors (see below), whose sum is σ = 37596152832. Its totient is φ = 5370878880.

The previous prime is 15665063507. The next prime is 15665063569. The reversal of 15665063540 is 4536056651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55946516 + ... + 55946795.

It is an arithmetic number, because the mean of its divisors is an integer number (1566506368).

Almost surely, 2^15665063540 is an apocalyptic number.

15665063540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15665063540 is an abundant number, since it is smaller than the sum of its proper divisors (21931089292).

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

15665063540 is a wasteful number, since it uses less digits than its factorization.

15665063540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111893327 (or 111893325 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 15665063540 in words is "fifteen billion, six hundred sixty-five million, sixty-three thousand, five hundred forty".