629556686891 has 4 divisors (see below), whose sum is σ = 686789112984. Its totient is φ = 572324260800.

The previous prime is 629556686831. The next prime is 629556686893. The reversal of 629556686891 is 198686655926.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 629556686891 - 2²² = 629552492587 is a prime.

It is a super-2 number, since 2×629556686891² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (629556686893) 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, 28616213030 + ... + 28616213051.

It is an arithmetic number, because the mean of its divisors is an integer number (171697278246).

Almost surely, 2^629556686891 is an apocalyptic number.

629556686891 is a deficient number, since it is larger than the sum of its proper divisors (57232426093).

629556686891 is a wasteful number, since it uses less digits than its factorization.

629556686891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57232426092.

The product of its digits is 335923200, while the sum is 71.

The spelling of 629556686891 in words is "six hundred twenty-nine billion, five hundred fifty-six million, six hundred eighty-six thousand, eight hundred ninety-one".