61530634536 has 64 divisors (see below), whose sum is σ = 175844254080. Its totient is φ = 17575937280.

The previous prime is 61530634523. The next prime is 61530634537. The reversal of 61530634536 is 63543603516.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (61530634537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689946 + ... + 774006.

It is an arithmetic number, because the mean of its divisors is an integer number (2747566470).

Almost surely, 2^61530634536 is an apocalyptic number.

It is an amenable number.

61530634536 is an abundant number, since it is smaller than the sum of its proper divisors (114313619544).

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

61530634536 is a wasteful number, since it uses less digits than its factorization.

61530634536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88434 (or 88430 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 42.

The spelling of 61530634536 in words is "sixty-one billion, five hundred thirty million, six hundred thirty-four thousand, five hundred thirty-six".