16465661640 has 64 divisors (see below), whose sum is σ = 54885542400. Its totient is φ = 4390842816.

The previous prime is 16465661603. The next prime is 16465661651. The reversal of 16465661640 is 4616656461.

It is a happy number.

16465661640 is a `hidden beast` number, since 1 + 6 + 46 + 566 + 1 + 6 + 40 = 666.

It is a super-2 number, since 2×16465661640² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 7621912 + ... + 7624071.

It is an arithmetic number, because the mean of its divisors is an integer number (857586600).

Almost surely, 2^16465661640 is an apocalyptic number.

16465661640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16465661640 is an abundant number, since it is smaller than the sum of its proper divisors (38419880760).

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

16465661640 is a wasteful number, since it uses less digits than its factorization.

16465661640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15246003 (or 15245993 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 16465661640 in words is "sixteen billion, four hundred sixty-five million, six hundred sixty-one thousand, six hundred forty".