16640641546 has 32 divisors (see below), whose sum is σ = 25761939840. Its totient is φ = 8056627200.

The previous prime is 16640641441. The next prime is 16640641561. The reversal of 16640641546 is 64514604661.

It is a happy number.

It is a super-2 number, since 2×16640641546² (a number of 21 digits) contains 22 as substring.

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, 6552745 + ... + 6555283.

It is an arithmetic number, because the mean of its divisors is an integer number (805060620).

Almost surely, 2^16640641546 is an apocalyptic number.

16640641546 is a deficient number, since it is larger than the sum of its proper divisors (9121298294).

16640641546 is a wasteful number, since it uses less digits than its factorization.

16640641546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 16640641546 in words is "sixteen billion, six hundred forty million, six hundred forty-one thousand, five hundred forty-six".