1640057951 has 4 divisors (see below), whose sum is σ = 1874351952. Its totient is φ = 1405763952.

The previous prime is 1640057929. The next prime is 1640057963. The reversal of 1640057951 is 1597500461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1597500461 = 59 ⋅27076279.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640057951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640057921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117146990 + ... + 117147003.

It is an arithmetic number, because the mean of its divisors is an integer number (468587988).

Almost surely, 2^1640057951 is an apocalyptic number.

1640057951 is a deficient number, since it is larger than the sum of its proper divisors (234294001).

1640057951 is an equidigital number, since it uses as much as digits as its factorization.

1640057951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234294000.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1640057951 is about 40497.6289552858. The cubic root of 1640057951 is about 1179.2875980928.

The spelling of 1640057951 in words is "one billion, six hundred forty million, fifty-seven thousand, nine hundred fifty-one".