626887886284661 has 2 divisors, whose sum is σ = 626887886284662. Its totient is φ = 626887886284660.

The previous prime is 626887886284589. The next prime is 626887886284741. The reversal of 626887886284661 is 166482688788626.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409938376894225 + 216949509390436 = 20246935^2 + 14729206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-626887886284661 is a prime.

It is a super-2 number, since 2×626887886284661² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626887886284861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313443943142330 + 313443943142331.

It is an arithmetic number, because the mean of its divisors is an integer number (313443943142331).

Almost surely, 2^{626887886284661} is an apocalyptic number.

It is an amenable number.

626887886284661 is a deficient number, since it is larger than the sum of its proper divisors (1).

626887886284661 is an equidigital number, since it uses as much as digits as its factorization.

626887886284661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28538044416, while the sum is 86.

The spelling of 626887886284661 in words is "six hundred twenty-six trillion, eight hundred eighty-seven billion, eight hundred eighty-six million, two hundred eighty-four thousand, six hundred sixty-one".