629213661 has 6 divisors (see below), whose sum is σ = 908864190. Its totient is φ = 419475768.

The previous prime is 629213653. The next prime is 629213677. The reversal of 629213661 is 166312926.

It is a happy number.

629213661 is a `hidden beast` number, since 6 + 292 + 1 + 366 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 576288036 + 52925625 = 24006^2 + 7275^2 .

It is not a de Polignac number, because 629213661 - 2³ = 629213653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629213681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34956306 + ... + 34956323.

It is an arithmetic number, because the mean of its divisors is an integer number (151477365).

Almost surely, 2^629213661 is an apocalyptic number.

It is an amenable number.

629213661 is a deficient number, since it is larger than the sum of its proper divisors (279650529).

629213661 is a wasteful number, since it uses less digits than its factorization.

629213661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69912635 (or 69912632 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 629213661 is about 25084.1316572849. The cubic root of 629213661 is about 856.9050738870.

The spelling of 629213661 in words is "six hundred twenty-nine million, two hundred thirteen thousand, six hundred sixty-one".