551501815807 has 2 divisors, whose sum is σ = 551501815808. Its totient is φ = 551501815806.

The previous prime is 551501815741. The next prime is 551501815819. The reversal of 551501815807 is 708518105155.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551501815807 is a prime.

It is a super-2 number, since 2×551501815807² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551501815847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275750907903 + 275750907904.

It is an arithmetic number, because the mean of its divisors is an integer number (275750907904).

Almost surely, 2^551501815807 is an apocalyptic number.

551501815807 is a deficient number, since it is larger than the sum of its proper divisors (1).

551501815807 is an equidigital number, since it uses as much as digits as its factorization.

551501815807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280000, while the sum is 46.

The spelling of 551501815807 in words is "five hundred fifty-one billion, five hundred one million, eight hundred fifteen thousand, eight hundred seven".