51520475399 has 2 divisors, whose sum is σ = 51520475400. Its totient is φ = 51520475398.

The previous prime is 51520475329. The next prime is 51520475431. The reversal of 51520475399 is 99357402515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520475399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51520475329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760237699 + 25760237700.

It is an arithmetic number, because the mean of its divisors is an integer number (25760237700).

Almost surely, 2^51520475399 is an apocalyptic number.

51520475399 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520475399 is an equidigital number, since it uses as much as digits as its factorization.

51520475399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701000, while the sum is 50.

The spelling of 51520475399 in words is "fifty-one billion, five hundred twenty million, four hundred seventy-five thousand, three hundred ninety-nine".