631734745623556 has 27 divisors (see below), whose sum is σ = 1107699780237141. Its totient is φ = 315250299777744.

The previous prime is 631734745623529. The next prime is 631734745623559. The reversal of 631734745623556 is 655326547437136.

The square root of 631734745623556 is 25134334.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 631314167433156 + 420578190400 = 25125966^2 + 648520^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631734745623491 and 631734745623500.

It is not an unprimeable number, because it can be changed into a prime (631734745623559) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26290501350 + ... + 26290525378.

Almost surely, 2^{631734745623556} is an apocalyptic number.

631734745623556 is the 25134334-th square number.

It is an amenable number.

631734745623556 is a deficient number, since it is larger than the sum of its proper divisors (475965034613585).

631734745623556 is an frugal number, since it uses more digits than its factorization.

631734745623556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49108 (or 24554 counting only the distinct ones).

The product of its digits is 1143072000, while the sum is 67.

The spelling of 631734745623556 in words is "six hundred thirty-one trillion, seven hundred thirty-four billion, seven hundred forty-five million, six hundred twenty-three thousand, five hundred fifty-six".