61660422415872 has 960 divisors, whose sum is σ = 213503638892544. Its totient is φ = 17401627975680.

The previous prime is 61660422415817. The next prime is 61660422415877. The reversal of 61660422415872 is 27851422406616.

61660422415872 is a `hidden beast` number, since 6 + 1 + 6 + 60 + 422 + 4 + 158 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660422415877) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 52656209847 + ... + 52656211017.

Almost surely, 2^{61660422415872} 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 61660422415872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106751819446272).

61660422415872 is an abundant number, since it is smaller than the sum of its proper divisors (151843216476672).

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

61660422415872 is a wasteful number, since it uses less digits than its factorization.

61660422415872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1873 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 61660422415872 in words is "sixty-one trillion, six hundred sixty billion, four hundred twenty-two million, four hundred fifteen thousand, eight hundred seventy-two".