61651661578080 has 192 divisors, whose sum is σ = 227359298815488. Its totient is φ = 13748105687040.

The previous prime is 61651661578079. The next prime is 61651661578163. The reversal of 61651661578080 is 8087516615616.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 223626982 + ... + 223902501.

It is an arithmetic number, because the mean of its divisors is an integer number (1184163014664).

Almost surely, 2^{61651661578080} is an apocalyptic number.

61651661578080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61651661578080 is an abundant number, since it is smaller than the sum of its proper divisors (165707637237408).

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

61651661578080 is a wasteful number, since it uses less digits than its factorization.

61651661578080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447529549 (or 447529541 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 60.

The spelling of 61651661578080 in words is "sixty-one trillion, six hundred fifty-one billion, six hundred sixty-one million, five hundred seventy-eight thousand, eighty".