1640064410666 has 32 divisors (see below), whose sum is σ = 2895224223168. Its totient is φ = 688393488640.

The previous prime is 1640064410659. The next prime is 1640064410681. The reversal of 1640064410666 is 6660144600461.

It is a happy number.

It is a super-2 number, since 2×1640064410666² (a number of 25 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, 41349980 + ... + 41389623.

It is an arithmetic number, because the mean of its divisors is an integer number (90475756974).

Almost surely, 2^{1640064410666} is an apocalyptic number.

1640064410666 is a deficient number, since it is larger than the sum of its proper divisors (1255159812502).

1640064410666 is a wasteful number, since it uses less digits than its factorization.

1640064410666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82739686.

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 1640064410666 in words is "one trillion, six hundred forty billion, sixty-four million, four hundred ten thousand, six hundred sixty-six".