15665453340 has 48 divisors (see below), whose sum is σ = 44289143808. Its totient is φ = 4136894784.

The previous prime is 15665453339. The next prime is 15665453357. The reversal of 15665453340 is 4335456651.

It is a junction number, because it is equal to n+sod(n) for n = 15665453292 and 15665453301.

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, 1261252 + ... + 1273611.

It is an arithmetic number, because the mean of its divisors is an integer number (922690496).

Almost surely, 2^15665453340 is an apocalyptic number.

15665453340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15665453340 is an abundant number, since it is smaller than the sum of its proper divisors (28623690468).

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

15665453340 is a wasteful number, since it uses less digits than its factorization.

15665453340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534978 (or 2534976 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 15665453340 in words is "fifteen billion, six hundred sixty-five million, four hundred fifty-three thousand, three hundred forty".