631011605540 has 12 divisors (see below), whose sum is σ = 1325124371676. Its totient is φ = 252404642208.

The previous prime is 631011605537. The next prime is 631011605561. The reversal of 631011605540 is 45506110136.

631011605540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 120475633216 + 510535972324 = 347096^2 + 714518^2 .

It is a junction number, because it is equal to n+sod(n) for n = 631011605497 and 631011605506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15775290119 + ... + 15775290158.

It is an arithmetic number, because the mean of its divisors is an integer number (110427030973).

Almost surely, 2^631011605540 is an apocalyptic number.

It is an amenable number.

631011605540 is an abundant number, since it is smaller than the sum of its proper divisors (694112766136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631011605540 is a wasteful number, since it uses less digits than its factorization.

631011605540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31550580286 (or 31550580284 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

Adding to 631011605540 its reverse (45506110136), we get a palindrome (676517715676).

The spelling of 631011605540 in words is "six hundred thirty-one billion, eleven million, six hundred five thousand, five hundred forty".