1640969057 has 16 divisors (see below), whose sum is σ = 2022155520. Its totient is φ = 1296741312.

The previous prime is 1640969039. The next prime is 1640969069. The reversal of 1640969057 is 7509690461.

It is a cyclic number.

It is not a de Polignac number, because 1640969057 - 2⁶ = 1640968993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640969027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65603 + ... + 87095.

It is an arithmetic number, because the mean of its divisors is an integer number (126384720).

Almost surely, 2^1640969057 is an apocalyptic number.

It is an amenable number.

1640969057 is a deficient number, since it is larger than the sum of its proper divisors (381186463).

1640969057 is a wasteful number, since it uses less digits than its factorization.

1640969057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22352.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 1640969057 is about 40508.8762742192. The cubic root of 1640969057 is about 1179.5059353172.

The spelling of 1640969057 in words is "one billion, six hundred forty million, nine hundred sixty-nine thousand, fifty-seven".