1640464566 has 32 divisors (see below), whose sum is σ = 3541116768. Its totient is φ = 503642880.

The previous prime is 1640464559. The next prime is 1640464601. The reversal of 1640464566 is 6654640461.

It is a super-2 number, since 2×1640464566² = 5382247984603136712, which contains 22 as substring.

It is a Curzon number.

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, 12636 + ... + 58656.

It is an arithmetic number, because the mean of its divisors is an integer number (110659899).

Almost surely, 2^1640464566 is an apocalyptic number.

1640464566 is an abundant number, since it is smaller than the sum of its proper divisors (1900652202).

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

1640464566 is a wasteful number, since it uses less digits than its factorization.

1640464566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46496.

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 1640464566 is about 40502.6488763389. The cubic root of 1640464566 is about 1179.3850492029.

The spelling of 1640464566 in words is "one billion, six hundred forty million, four hundred sixty-four thousand, five hundred sixty-six".