626651655551 has 2 divisors, whose sum is σ = 626651655552. Its totient is φ = 626651655550.

The previous prime is 626651655503. The next prime is 626651655557. The reversal of 626651655551 is 155556156626.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-626651655551 is a prime.

It is a super-2 number, since 2×626651655551² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 626651655493 and 626651655502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626651655557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313325827775 + 313325827776.

It is an arithmetic number, because the mean of its divisors is an integer number (313325827776).

Almost surely, 2^626651655551 is an apocalyptic number.

626651655551 is a deficient number, since it is larger than the sum of its proper divisors (1).

626651655551 is an equidigital number, since it uses as much as digits as its factorization.

626651655551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100000, while the sum is 53.

The spelling of 626651655551 in words is "six hundred twenty-six billion, six hundred fifty-one million, six hundred fifty-five thousand, five hundred fifty-one".