2638977853 has 2 divisors, whose sum is σ = 2638977854. Its totient is φ = 2638977852.

The previous prime is 2638977823. The next prime is 2638977907. The reversal of 2638977853 is 3587798362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2057348164 + 581629689 = 45358^2 + 24117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2638977853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638977823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319488926 + 1319488927.

It is an arithmetic number, because the mean of its divisors is an integer number (1319488927).

Almost surely, 2^2638977853 is an apocalyptic number.

It is an amenable number.

2638977853 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638977853 is an equidigital number, since it uses as much as digits as its factorization.

2638977853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 58.

The square root of 2638977853 is about 51370.9825971822. The cubic root of 2638977853 is about 1381.9062525635.

The spelling of 2638977853 in words is "two billion, six hundred thirty-eight million, nine hundred seventy-seven thousand, eight hundred fifty-three".