1640455713 has 32 divisors (see below), whose sum is σ = 2619724800. Its totient is φ = 1008557568.

The previous prime is 1640455709. The next prime is 1640455721. The reversal of 1640455713 is 3175540461.

1640455713 is a `hidden beast` number, since 1 + 6 + 40 + 45 + 571 + 3 = 666.

It is not a de Polignac number, because 1640455713 - 2² = 1640455709 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640455723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 616081 + ... + 618737.

It is an arithmetic number, because the mean of its divisors is an integer number (81866400).

Almost surely, 2^1640455713 is an apocalyptic number.

1640455713 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1640455713 is a deficient number, since it is larger than the sum of its proper divisors (979269087).

1640455713 is a wasteful number, since it uses less digits than its factorization.

1640455713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4438 (or 4432 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 1640455713 is about 40502.5395870432. The cubic root of 1640455713 is about 1179.3829276261.

The spelling of 1640455713 in words is "one billion, six hundred forty million, four hundred fifty-five thousand, seven hundred thirteen".