51615560501 has 2 divisors, whose sum is σ = 51615560502. Its totient is φ = 51615560500.

The previous prime is 51615560473. The next prime is 51615560609. The reversal of 51615560501 is 10506551615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41189108401 + 10426452100 = 202951^2 + 102110^2 .

It is a cyclic number.

It is not a de Polignac number, because 51615560501 - 2²² = 51611366197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51615566501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25807780250 + 25807780251.

It is an arithmetic number, because the mean of its divisors is an integer number (25807780251).

Almost surely, 2^51615560501 is an apocalyptic number.

It is an amenable number.

51615560501 is a deficient number, since it is larger than the sum of its proper divisors (1).

51615560501 is an equidigital number, since it uses as much as digits as its factorization.

51615560501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 51615560501 in words is "fifty-one billion, six hundred fifteen million, five hundred sixty thousand, five hundred one".