51612021157 has 2 divisors, whose sum is σ = 51612021158. Its totient is φ = 51612021156.

The previous prime is 51612021133. The next prime is 51612021161. The reversal of 51612021157 is 75112021615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51471811876 + 140209281 = 226874^2 + 11841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51612021157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51612021557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25806010578 + 25806010579.

It is an arithmetic number, because the mean of its divisors is an integer number (25806010579).

Almost surely, 2^51612021157 is an apocalyptic number.

It is an amenable number.

51612021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

51612021157 is an equidigital number, since it uses as much as digits as its factorization.

51612021157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 51612021157 in words is "fifty-one billion, six hundred twelve million, twenty-one thousand, one hundred fifty-seven".