61215491232 has 384 divisors, whose sum is σ = 216815961600. Its totient is φ = 16428883968.

The previous prime is 61215491213. The next prime is 61215491263. The reversal of 61215491232 is 23219451216.

61215491232 is a `hidden beast` number, since 61 + 21 + 549 + 1 + 2 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6484788 + ... + 6494220.

It is an arithmetic number, because the mean of its divisors is an integer number (564624900).

Almost surely, 2^61215491232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61215491232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108407980800).

61215491232 is an abundant number, since it is smaller than the sum of its proper divisors (155600470368).

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

61215491232 is a wasteful number, since it uses less digits than its factorization.

61215491232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9525 (or 9511 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The spelling of 61215491232 in words is "sixty-one billion, two hundred fifteen million, four hundred ninety-one thousand, two hundred thirty-two".