640933329701 has 4 divisors (see below), whose sum is σ = 732495233952. Its totient is φ = 549371425452.

The previous prime is 640933329599. The next prime is 640933329713. The reversal of 640933329701 is 107923339046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 107923339046 = 2 ⋅53961669523.

It is a cyclic number.

It is not a de Polignac number, because 640933329701 - 2²² = 640929135397 is a prime.

It is a super-2 number, since 2×640933329701² (a number of 24 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 (640933326701) 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, 45780952115 + ... + 45780952128.

It is an arithmetic number, because the mean of its divisors is an integer number (183123808488).

Almost surely, 2^640933329701 is an apocalyptic number.

It is an amenable number.

640933329701 is a deficient number, since it is larger than the sum of its proper divisors (91561904251).

640933329701 is an equidigital number, since it uses as much as digits as its factorization.

640933329701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91561904250.

The product of its (nonzero) digits is 734832, while the sum is 47.

The spelling of 640933329701 in words is "six hundred forty billion, nine hundred thirty-three million, three hundred twenty-nine thousand, seven hundred one".