61310685551 has 2 divisors, whose sum is σ = 61310685552. Its totient is φ = 61310685550.

The previous prime is 61310685529. The next prime is 61310685619. The reversal of 61310685551 is 15558601316.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61310685551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61310685499 and 61310685508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61310685251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655342775 + 30655342776.

It is an arithmetic number, because the mean of its divisors is an integer number (30655342776).

Almost surely, 2^61310685551 is an apocalyptic number.

61310685551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61310685551 is an equidigital number, since it uses as much as digits as its factorization.

61310685551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 61310685551 in words is "sixty-one billion, three hundred ten million, six hundred eighty-five thousand, five hundred fifty-one".