51105499987 has 2 divisors, whose sum is σ = 51105499988. Its totient is φ = 51105499986.

The previous prime is 51105499933. The next prime is 51105500029. The reversal of 51105499987 is 78999450115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51105499987 - 2³¹ = 48958016339 is a prime.

It is a super-2 number, since 2×51105499987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51405499987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25552749993 + 25552749994.

It is an arithmetic number, because the mean of its divisors is an integer number (25552749994).

Almost surely, 2^51105499987 is an apocalyptic number.

51105499987 is a deficient number, since it is larger than the sum of its proper divisors (1).

51105499987 is an equidigital number, since it uses as much as digits as its factorization.

51105499987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4082400, while the sum is 58.

The spelling of 51105499987 in words is "fifty-one billion, one hundred five million, four hundred ninety-nine thousand, nine hundred eighty-seven".