661036137534 has 24 divisors (see below), whose sum is σ = 1446150259632. Its totient is φ = 218206103040.

The previous prime is 661036137527. The next prime is 661036137547. The reversal of 661036137534 is 435731630166.

661036137534 is a `hidden beast` number, since 6 + 6 + 103 + 6 + 1 + 3 + 7 + 534 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 661036137534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178271107 + ... + 178274814.

It is an arithmetic number, because the mean of its divisors is an integer number (60256260818).

Almost surely, 2^661036137534 is an apocalyptic number.

661036137534 is an abundant number, since it is smaller than the sum of its proper divisors (785114122098).

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

661036137534 is a wasteful number, since it uses less digits than its factorization.

661036137534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356546032 (or 356546029 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

It can be divided in two parts, 6610 and 36137534, that added together give a square (36144144 = 6012²).

The spelling of 661036137534 in words is "six hundred sixty-one billion, thirty-six million, one hundred thirty-seven thousand, five hundred thirty-four".