661406531562 has 64 divisors (see below), whose sum is σ = 1737685497600. Its totient is φ = 182456971200.

The previous prime is 661406531561. The next prime is 661406531567. The reversal of 661406531562 is 265135604166.

661406531562 is a `hidden beast` number, since 6 + 61 + 4 + 0 + 6 + 531 + 56 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (661406531561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30157189 + ... + 30179112.

It is an arithmetic number, because the mean of its divisors is an integer number (27151335900).

Almost surely, 2^661406531562 is an apocalyptic number.

661406531562 is an abundant number, since it is smaller than the sum of its proper divisors (1076278966038).

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

661406531562 is a wasteful number, since it uses less digits than its factorization.

661406531562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60336348 (or 60336342 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 661406531562 in words is "six hundred sixty-one billion, four hundred six million, five hundred thirty-one thousand, five hundred sixty-two".