61547762544 has 80 divisors (see below), whose sum is σ = 161772979200. Its totient is φ = 20158253568.

The previous prime is 61547762533. The next prime is 61547762597. The reversal of 61547762544 is 44526774516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7696212 + ... + 7704204.

It is an arithmetic number, because the mean of its divisors is an integer number (2022162240).

Almost surely, 2^61547762544 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 61547762544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80886489600).

61547762544 is an abundant number, since it is smaller than the sum of its proper divisors (100225216656).

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

61547762544 is a wasteful number, since it uses less digits than its factorization.

61547762544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10782 (or 10776 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 51.

The spelling of 61547762544 in words is "sixty-one billion, five hundred forty-seven million, seven hundred sixty-two thousand, five hundred forty-four".