61631801655553 has 24 divisors (see below), whose sum is σ = 64249758929664. Its totient is φ = 59073866467200.

The previous prime is 61631801655533. The next prime is 61631801655569. The reversal of 61631801655553 is 35555610813616.

It is a happy number.

It is not a de Polignac number, because 61631801655553 - 2⁴¹ = 59432778400001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61631801655494 and 61631801655503.

It is not an unprimeable number, because it can be changed into a prime (61631801655533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90634608 + ... + 91312078.

It is an arithmetic number, because the mean of its divisors is an integer number (2677073288736).

Almost surely, 2^{61631801655553} is an apocalyptic number.

It is an amenable number.

61631801655553 is a deficient number, since it is larger than the sum of its proper divisors (2617957274111).

61631801655553 is a wasteful number, since it uses less digits than its factorization.

61631801655553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677913 (or 677776 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 55.

The spelling of 61631801655553 in words is "sixty-one trillion, six hundred thirty-one billion, eight hundred one million, six hundred fifty-five thousand, five hundred fifty-three".