1640517800379 has 12 divisors (see below), whose sum is σ = 2239408838376. Its totient is φ = 1068244145472.

The previous prime is 1640517800351. The next prime is 1640517800393. The reversal of 1640517800379 is 9730087150461.

It is a happy number.

It is not a de Polignac number, because 1640517800379 - 2⁸ = 1640517800123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640517800179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147868782 + ... + 147879875.

It is an arithmetic number, because the mean of its divisors is an integer number (186617403198).

Almost surely, 2^{1640517800379} is an apocalyptic number.

1640517800379 is a deficient number, since it is larger than the sum of its proper divisors (598891037997).

1640517800379 is an equidigital number, since it uses as much as digits as its factorization.

1640517800379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295748746 (or 295748703 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 1640517800379 in words is "one trillion, six hundred forty billion, five hundred seventeen million, eight hundred thousand, three hundred seventy-nine".