629771661 has 12 divisors (see below), whose sum is σ = 910735488. Its totient is φ = 419356104.

The previous prime is 629771651. The next prime is 629771669. The reversal of 629771661 is 166177926.

It is a happy number.

629771661 is a `hidden beast` number, since 629 + 7 + 7 + 16 + 6 + 1 = 666.

It is not a de Polignac number, because 629771661 - 2⁵ = 629771629 is a prime.

It is a super-3 number, since 3×629771661³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629771669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32775 + ... + 48308.

It is an arithmetic number, because the mean of its divisors is an integer number (75894624).

Almost surely, 2^629771661 is an apocalyptic number.

It is an amenable number.

629771661 is a deficient number, since it is larger than the sum of its proper divisors (280963827).

629771661 is a wasteful number, since it uses less digits than its factorization.

629771661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81952 (or 81949 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 629771661 is about 25095.2517620366. The cubic root of 629771661 is about 857.1583062334.

The spelling of 629771661 in words is "six hundred twenty-nine million, seven hundred seventy-one thousand, six hundred sixty-one".