51555520253551 has 2 divisors, whose sum is σ = 51555520253552. Its totient is φ = 51555520253550.

The previous prime is 51555520253537. The next prime is 51555520253557. The reversal of 51555520253551 is 15535202555515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51555520253551 - 2¹⁵ = 51555520220783 is a prime.

It is a super-2 number, since 2×51555520253551² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51555520253495 and 51555520253504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51555520253557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25777760126775 + 25777760126776.

It is an arithmetic number, because the mean of its divisors is an integer number (25777760126776).

Almost surely, 2^{51555520253551} is an apocalyptic number.

51555520253551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51555520253551 is an equidigital number, since it uses as much as digits as its factorization.

51555520253551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4687500, while the sum is 49.

The spelling of 51555520253551 in words is "fifty-one trillion, five hundred fifty-five billion, five hundred twenty million, two hundred fifty-three thousand, five hundred fifty-one".