631720670068 has 6 divisors (see below), whose sum is σ = 1105511172626. Its totient is φ = 315860335032.

The previous prime is 631720670027. The next prime is 631720670081. The reversal of 631720670068 is 860076027136.

It can be written as a sum of positive squares in only one way, i.e., 445492172304 + 186228497764 = 667452^2 + 431542^2 .

It is a super-2 number, since 2×631720670068² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78965083755 + ... + 78965083762.

Almost surely, 2^631720670068 is an apocalyptic number.

It is an amenable number.

631720670068 is a deficient number, since it is larger than the sum of its proper divisors (473790502558).

631720670068 is a wasteful number, since it uses less digits than its factorization.

631720670068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157930167521 (or 157930167519 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 631720670068 in words is "six hundred thirty-one billion, seven hundred twenty million, six hundred seventy thousand, sixty-eight".