61987544325 has 252 divisors, whose sum is σ = 137410337988. Its totient is φ = 27629683200.

The previous prime is 61987544321. The next prime is 61987544371. The reversal of 61987544325 is 52344578916.

It is a happy number.

61987544325 is a `hidden beast` number, since 6 + 1 + 98 + 7 + 544 + 3 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 13422844449 + 48564699876 = 115857^2 + 220374^2 .

It is not a de Polignac number, because 61987544325 - 2² = 61987544321 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61987544321) by changing a digit.

It is a polite number, since it can be written in 251 ways as a sum of consecutive naturals, for example, 36613179 + ... + 36614871.

It is an arithmetic number, because the mean of its divisors is an integer number (545279119).

Almost surely, 2^61987544325 is an apocalyptic number.

It is an amenable number.

61987544325 is an abundant number, since it is smaller than the sum of its proper divisors (75422793663).

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

61987544325 is a wasteful number, since it uses less digits than its factorization.

61987544325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1749 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 61987544325 in words is "sixty-one billion, nine hundred eighty-seven million, five hundred forty-four thousand, three hundred twenty-five".