61645451258988 has 96 divisors (see below), whose sum is σ = 162545636736000. Its totient is φ = 20198308173120.

The previous prime is 61645451258987. The next prime is 61645451258999. The reversal of 61645451258988 is 88985215454616.

61645451258988 is a `hidden beast` number, since 6 + 1 + 6 + 4 + 54 + 512 + 58 + 9 + 8 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (61645451258981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68247853 + ... + 69145211.

It is an arithmetic number, because the mean of its divisors is an integer number (1693183716000).

Almost surely, 2^{61645451258988} 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 61645451258988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81272818368000).

61645451258988 is an abundant number, since it is smaller than the sum of its proper divisors (100900185477012).

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

61645451258988 is a wasteful number, since it uses less digits than its factorization.

61645451258988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908212 (or 908204 counting only the distinct ones).

The product of its digits is 663552000, while the sum is 72.

The spelling of 61645451258988 in words is "sixty-one trillion, six hundred forty-five billion, four hundred fifty-one million, two hundred fifty-eight thousand, nine hundred eighty-eight".