1640388765379 has 16 divisors (see below), whose sum is σ = 2137701198528. Its totient is φ = 1221543539712.

The previous prime is 1640388765373. The next prime is 1640388765383. The reversal of 1640388765379 is 9735678830461.

It is a de Polignac number, because none of the positive numbers 2^k-1640388765379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640388765373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530182282 + ... + 530185375.

It is an arithmetic number, because the mean of its divisors is an integer number (133606324908).

Almost surely, 2^{1640388765379} is an apocalyptic number.

1640388765379 is a deficient number, since it is larger than the sum of its proper divisors (497312433149).

1640388765379 is a wasteful number, since it uses less digits than its factorization.

1640388765379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060367694.

The product of its (nonzero) digits is 182891520, while the sum is 67.

The spelling of 1640388765379 in words is "one trillion, six hundred forty billion, three hundred eighty-eight million, seven hundred sixty-five thousand, three hundred seventy-nine".