61372686540 has 192 divisors, whose sum is σ = 192807014400. Its totient is φ = 14457864960.

The previous prime is 61372686503. The next prime is 61372686547. The reversal of 61372686540 is 4568627316.

It is a self number, because there is not a number n which added to its sum of digits gives 61372686540.

It is not an unprimeable number, because it can be changed into a prime (61372686547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5642187 + ... + 5653053.

It is an arithmetic number, because the mean of its divisors is an integer number (1004203200).

Almost surely, 2^61372686540 is an apocalyptic number.

61372686540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61372686540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96403507200).

61372686540 is an abundant number, since it is smaller than the sum of its proper divisors (131434327860).

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

61372686540 is a wasteful number, since it uses less digits than its factorization.

61372686540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11132 (or 11130 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 61372686540 in words is "sixty-one billion, three hundred seventy-two million, six hundred eighty-six thousand, five hundred forty".