1640259377291 has 4 divisors (see below), whose sum is σ = 1736745223032. Its totient is φ = 1543773531552.

The previous prime is 1640259377279. The next prime is 1640259377299. The reversal of 1640259377291 is 1927739520461.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1640259377291 - 2²² = 1640255182987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640259377299) 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, 48242922845 + ... + 48242922878.

It is an arithmetic number, because the mean of its divisors is an integer number (434186305758).

Almost surely, 2^{1640259377291} is an apocalyptic number.

1640259377291 is a deficient number, since it is larger than the sum of its proper divisors (96485845741).

1640259377291 is an equidigital number, since it uses as much as digits as its factorization.

1640259377291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96485845740.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 1640259377291 in words is "one trillion, six hundred forty billion, two hundred fifty-nine million, three hundred seventy-seven thousand, two hundred ninety-one".