51520541551 has 2 divisors, whose sum is σ = 51520541552. Its totient is φ = 51520541550.

The previous prime is 51520541473. The next prime is 51520541557. The reversal of 51520541551 is 15514502515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51520541551 - 2²⁵ = 51486987119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51520541557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760270775 + 25760270776.

It is an arithmetic number, because the mean of its divisors is an integer number (25760270776).

Almost surely, 2^51520541551 is an apocalyptic number.

51520541551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520541551 is an equidigital number, since it uses as much as digits as its factorization.

51520541551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25000, while the sum is 34.

The spelling of 51520541551 in words is "fifty-one billion, five hundred twenty million, five hundred forty-one thousand, five hundred fifty-one".