61656413533 has 16 divisors (see below), whose sum is σ = 72640766016. Its totient is φ = 51593034240.

The previous prime is 61656413503. The next prime is 61656413537. The reversal of 61656413533 is 33531465616.

It is a happy number.

61656413533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-61656413533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61656413533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656413537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560235 + ... + 661192.

It is an arithmetic number, because the mean of its divisors is an integer number (4540047876).

Almost surely, 2^61656413533 is an apocalyptic number.

It is an amenable number.

61656413533 is a deficient number, since it is larger than the sum of its proper divisors (10984352483).

61656413533 is a wasteful number, since it uses less digits than its factorization.

61656413533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221804.

The product of its digits is 583200, while the sum is 43.

The spelling of 61656413533 in words is "sixty-one billion, six hundred fifty-six million, four hundred thirteen thousand, five hundred thirty-three".