640980591629 has 8 divisors (see below), whose sum is σ = 733736528448. Its totient is φ = 548521475040.

The previous prime is 640980591623. The next prime is 640980591637. The reversal of 640980591629 is 926195089046.

640980591629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-640980591629 is a prime.

It is a super-2 number, since 2×640980591629² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640980591623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74200427 + ... + 74209064.

It is an arithmetic number, because the mean of its divisors is an integer number (91717066056).

Almost surely, 2^640980591629 is an apocalyptic number.

It is an amenable number.

640980591629 is a deficient number, since it is larger than the sum of its proper divisors (92755936819).

640980591629 is a wasteful number, since it uses less digits than its factorization.

640980591629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148410115.

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 640980591629 in words is "six hundred forty billion, nine hundred eighty million, five hundred ninety-one thousand, six hundred twenty-nine".