631550661643 has 4 divisors (see below), whose sum is σ = 688964358168. Its totient is φ = 574136965120.

The previous prime is 631550661641. The next prime is 631550661647. The reversal of 631550661643 is 346166055136.

It is a happy number.

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 631550661643 - 2¹ = 631550661641 is a prime.

It is a super-2 number, since 2×631550661643² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631550661593 and 631550661602.

It is not an unprimeable number, because it can be changed into a prime (631550661641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28706848246 + ... + 28706848267.

It is an arithmetic number, because the mean of its divisors is an integer number (172241089542).

Almost surely, 2^631550661643 is an apocalyptic number.

631550661643 is a deficient number, since it is larger than the sum of its proper divisors (57413696525).

631550661643 is a wasteful number, since it uses less digits than its factorization.

631550661643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57413696524.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 631550661643 in words is "six hundred thirty-one billion, five hundred fifty million, six hundred sixty-one thousand, six hundred forty-three".