2630391857 has 2 divisors, whose sum is σ = 2630391858. Its totient is φ = 2630391856.

The previous prime is 2630391847. The next prime is 2630391949. The reversal of 2630391857 is 7581930362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1774010161 + 856381696 = 42119^2 + 29264^2 .

It is a cyclic number.

It is not a de Polignac number, because 2630391857 - 2¹⁸ = 2630129713 is a prime.

It is a super-2 number, since 2×2630391857² = 13837922642743816898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2630391847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315195928 + 1315195929.

It is an arithmetic number, because the mean of its divisors is an integer number (1315195929).

Almost surely, 2^2630391857 is an apocalyptic number.

It is an amenable number.

2630391857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2630391857 is an equidigital number, since it uses as much as digits as its factorization.

2630391857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 2630391857 is about 51287.3459734465. The cubic root of 2630391857 is about 1380.4059327064.

The spelling of 2630391857 in words is "two billion, six hundred thirty million, three hundred ninety-one thousand, eight hundred fifty-seven".