61329747792 has 80 divisors (see below), whose sum is σ = 160429731840. Its totient is φ = 20186153856.

The previous prime is 61329747769. The next prime is 61329747793. The reversal of 61329747792 is 29774792316.

It is a happy number.

61329747792 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61329747792² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61329747793) 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, 11467263 + ... + 11472609.

It is an arithmetic number, because the mean of its divisors is an integer number (2005371648).

Almost surely, 2^61329747792 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 61329747792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80214865920).

61329747792 is an abundant number, since it is smaller than the sum of its proper divisors (99099984048).

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

61329747792 is a wasteful number, since it uses less digits than its factorization.

61329747792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320 (or 8314 counting only the distinct ones).

The product of its digits is 8001504, while the sum is 57.

The spelling of 61329747792 in words is "sixty-one billion, three hundred twenty-nine million, seven hundred forty-seven thousand, seven hundred ninety-two".