61631801655551 has 8 divisors (see below), whose sum is σ = 61683209331744. Its totient is φ = 61580395238400.

The previous prime is 61631801655533. The next prime is 61631801655569. The reversal of 61631801655551 is 15555610813616.

It is an interprime number because it is at equal distance from previous prime (61631801655533) and next prime (61631801655569).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61631801655551 is a prime.

It is a super-2 number, since 2×61631801655551² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61631801655493 and 61631801655502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61636801655551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115288691 + ... + 115822043.

It is an arithmetic number, because the mean of its divisors is an integer number (7710401166468).

Almost surely, 2^{61631801655551} is an apocalyptic number.

61631801655551 is a deficient number, since it is larger than the sum of its proper divisors (51407676193).

61631801655551 is a wasteful number, since it uses less digits than its factorization.

61631801655551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629521.

The product of its (nonzero) digits is 3240000, while the sum is 53.

The spelling of 61631801655551 in words is "sixty-one trillion, six hundred thirty-one billion, eight hundred one million, six hundred fifty-five thousand, five hundred fifty-one".