61686730366560 has 192 divisors, whose sum is σ = 232511522362560. Its totient is φ = 15184425922560.

The previous prime is 61686730366559. The next prime is 61686730366579. The reversal of 61686730366560 is 6566303768616.

61686730366560 is a `hidden beast` number, since 6 + 1 + 6 + 8 + 6 + 7 + 3 + 0 + 3 + 66 + 560 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 549149061 + ... + 549261380.

It is an arithmetic number, because the mean of its divisors is an integer number (1210997512305).

Almost surely, 2^{61686730366560} is an apocalyptic number.

61686730366560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61686730366560 is an abundant number, since it is smaller than the sum of its proper divisors (170824791996000).

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

61686730366560 is a wasteful number, since it uses less digits than its factorization.

61686730366560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098410478 (or 1098410464 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 63.

The spelling of 61686730366560 in words is "sixty-one trillion, six hundred eighty-six billion, seven hundred thirty million, three hundred sixty-six thousand, five hundred sixty".