61551533524 has 96 divisors (see below), whose sum is σ = 124606137600. Its totient is φ = 26367897600.

The previous prime is 61551533521. The next prime is 61551533567. The reversal of 61551533524 is 42533515516.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551533521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9676257 + ... + 9682615.

It is an arithmetic number, because the mean of its divisors is an integer number (1297980600).

Almost surely, 2^61551533524 is an apocalyptic number.

It is an amenable number.

61551533524 is an abundant number, since it is smaller than the sum of its proper divisors (63054604076).

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

61551533524 is a wasteful number, since it uses less digits than its factorization.

61551533524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6593 (or 6591 counting only the distinct ones).

The product of its digits is 270000, while the sum is 40.

The spelling of 61551533524 in words is "sixty-one billion, five hundred fifty-one million, five hundred thirty-three thousand, five hundred twenty-four".