51511203577 has 2 divisors, whose sum is σ = 51511203578. Its totient is φ = 51511203576.

The previous prime is 51511203517. The next prime is 51511203593. The reversal of 51511203577 is 77530211515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48096437481 + 3414766096 = 219309^2 + 58436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51511203577 is a prime.

It is a super-2 number, since 2×51511203577² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51511203517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25755601788 + 25755601789.

It is an arithmetic number, because the mean of its divisors is an integer number (25755601789).

Almost surely, 2^51511203577 is an apocalyptic number.

It is an amenable number.

51511203577 is a deficient number, since it is larger than the sum of its proper divisors (1).

51511203577 is an equidigital number, since it uses as much as digits as its factorization.

51511203577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36750, while the sum is 37.

The spelling of 51511203577 in words is "fifty-one billion, five hundred eleven million, two hundred three thousand, five hundred seventy-seven".