1640635379501 has 16 divisors (see below), whose sum is σ = 1691178238848. Its totient is φ = 1590596352000.

The previous prime is 1640635379479. The next prime is 1640635379521. The reversal of 1640635379501 is 1059735360461.

It is a cyclic number.

It is not a de Polignac number, because 1640635379501 - 2¹⁰ = 1640635378477 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640635379501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640635379521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96233360 + ... + 96250406.

It is an arithmetic number, because the mean of its divisors is an integer number (105698639928).

Almost surely, 2^{1640635379501} is an apocalyptic number.

It is an amenable number.

1640635379501 is a deficient number, since it is larger than the sum of its proper divisors (50542859347).

1640635379501 is a wasteful number, since it uses less digits than its factorization.

1640635379501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31652.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 1640635379501 in words is "one trillion, six hundred forty billion, six hundred thirty-five million, three hundred seventy-nine thousand, five hundred one".