61455888062640 has 200 divisors, whose sum is σ = 214551342918528. Its totient is φ = 16303323340800.

The previous prime is 61455888062629. The next prime is 61455888062663. The reversal of 61455888062640 is 4626088855416.

61455888062640 is a `hidden beast` number, since 6 + 1 + 4 + 5 + 588 + 8 + 0 + 6 + 2 + 6 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23319136 + ... + 25820415.

Almost surely, 2^{61455888062640} is an apocalyptic number.

61455888062640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61455888062640 is an abundant number, since it is smaller than the sum of its proper divisors (153095454855888).

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

61455888062640 is a wasteful number, since it uses less digits than its factorization.

61455888062640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49139769 (or 49139754 counting only the distinct ones).

The product of its (nonzero) digits is 88473600, while the sum is 63.

The spelling of 61455888062640 in words is "sixty-one trillion, four hundred fifty-five billion, eight hundred eighty-eight million, sixty-two thousand, six hundred forty".