631720670069 has 4 divisors (see below), whose sum is σ = 631747498944. Its totient is φ = 631693841196.

The previous prime is 631720670027. The next prime is 631720670081. The reversal of 631720670069 is 960076027136.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 631720670069 - 2³² = 627425702773 is a prime.

It is a super-2 number, since 2×631720670069² (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 (631720673069) 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, 13379087 + ... + 13426220.

It is an arithmetic number, because the mean of its divisors is an integer number (157936874736).

Almost surely, 2^631720670069 is an apocalyptic number.

It is an amenable number.

631720670069 is a deficient number, since it is larger than the sum of its proper divisors (26828875).

631720670069 is a wasteful number, since it uses less digits than its factorization.

631720670069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26828874.

The product of its (nonzero) digits is 571536, while the sum is 47.

The spelling of 631720670069 in words is "six hundred thirty-one billion, seven hundred twenty million, six hundred seventy thousand, sixty-nine".