61631801655552 has 180 divisors, whose sum is σ = 183885226808976. Its totient is φ = 20531598474240.

The previous prime is 61631801655533. The next prime is 61631801655569. The reversal of 61631801655552 is 25555610813616.

61631801655552 is a `hidden beast` number, since 6 + 1 + 6 + 3 + 1 + 80 + 1 + 6 + 5 + 5 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33675427 + ... + 35458397.

Almost surely, 2^{61631801655552} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61631801655552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91942613404488).

61631801655552 is an abundant number, since it is smaller than the sum of its proper divisors (122253425153424).

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

61631801655552 is a wasteful number, since it uses less digits than its factorization.

61631801655552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784666 (or 1784643 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 54.

The spelling of 61631801655552 in words is "sixty-one trillion, six hundred thirty-one billion, eight hundred one million, six hundred fifty-five thousand, five hundred fifty-two".