629901661 has 16 divisors (see below), whose sum is σ = 689990400. Its totient is φ = 572989248.

The previous prime is 629901647. The next prime is 629901719. The reversal of 629901661 is 166109926.

629901661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 629901661 - 2²⁵ = 596347229 is a prime.

It is a super-2 number, since 2×629901661² = 793552205061117842, which 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 (629901611) 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, 40675 + ... + 53983.

It is an arithmetic number, because the mean of its divisors is an integer number (43124400).

Almost surely, 2^629901661 is an apocalyptic number.

It is an amenable number.

629901661 is a deficient number, since it is larger than the sum of its proper divisors (60088739).

629901661 is a wasteful number, since it uses less digits than its factorization.

629901661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13428.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 629901661 is about 25097.8417598008. The cubic root of 629901661 is about 857.2172815310.

The spelling of 629901661 in words is "six hundred twenty-nine million, nine hundred one thousand, six hundred sixty-one".