1640253651 has 16 divisors (see below), whose sum is σ = 2197377024. Its totient is φ = 1088328384.

The previous prime is 1640253613. The next prime is 1640253661. The reversal of 1640253651 is 1563520461.

It is not a de Polignac number, because 1640253651 - 2⁷ = 1640253523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640253661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1019890 + ... + 1021496.

It is an arithmetic number, because the mean of its divisors is an integer number (137336064).

Almost surely, 2^1640253651 is an apocalyptic number.

1640253651 is a deficient number, since it is larger than the sum of its proper divisors (557123373).

1640253651 is a wasteful number, since it uses less digits than its factorization.

1640253651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3010.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1640253651 is about 40500.0450740490. The cubic root of 1640253651 is about 1179.3345024118.

The spelling of 1640253651 in words is "one billion, six hundred forty million, two hundred fifty-three thousand, six hundred fifty-one".