629402879581 has 4 divisors (see below), whose sum is σ = 719317576672. Its totient is φ = 539488182492.

The previous prime is 629402879551. The next prime is 629402879597. The reversal of 629402879581 is 185978204926.

629402879581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 629402879581 - 2²³ = 629394490973 is a prime.

It is a super-2 number, since 2×629402879581² (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 (629402879551) 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, 44957348535 + ... + 44957348548.

It is an arithmetic number, because the mean of its divisors is an integer number (179829394168).

Almost surely, 2^629402879581 is an apocalyptic number.

It is an amenable number.

629402879581 is a deficient number, since it is larger than the sum of its proper divisors (89914697091).

629402879581 is an equidigital number, since it uses as much as digits as its factorization.

629402879581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89914697090.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 629402879581 in words is "six hundred twenty-nine billion, four hundred two million, eight hundred seventy-nine thousand, five hundred eighty-one".