1640145253631 has 4 divisors (see below), whose sum is σ = 1642045770432. Its totient is φ = 1638244736832.

The previous prime is 1640145253603. The next prime is 1640145253699. The reversal of 1640145253631 is 1363525410461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640145253631 is a prime.

It is a super-2 number, since 2×1640145253631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640145253601) 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, 950257106 + ... + 950258831.

It is an arithmetic number, because the mean of its divisors is an integer number (410511442608).

Almost surely, 2^{1640145253631} is an apocalyptic number.

1640145253631 is a deficient number, since it is larger than the sum of its proper divisors (1900516801).

1640145253631 is an equidigital number, since it uses as much as digits as its factorization.

1640145253631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900516800.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 1640145253631 in words is "one trillion, six hundred forty billion, one hundred forty-five million, two hundred fifty-three thousand, six hundred thirty-one".