2638687152869 has 2 divisors, whose sum is σ = 2638687152870. Its totient is φ = 2638687152868.

The previous prime is 2638687152851. The next prime is 2638687152917. The reversal of 2638687152869 is 9682517868362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1397802550369 + 1240884602500 = 1182287^2 + 1113950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638687152869 - 2⁸ = 2638687152613 is a prime.

It is a super-2 number, since 2×2638687152869² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638687152839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319343576434 + 1319343576435.

It is an arithmetic number, because the mean of its divisors is an integer number (1319343576435).

Almost surely, 2^{2638687152869} is an apocalyptic number.

It is an amenable number.

2638687152869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638687152869 is an equidigital number, since it uses as much as digits as its factorization.

2638687152869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 418037760, while the sum is 71.

The spelling of 2638687152869 in words is "two trillion, six hundred thirty-eight billion, six hundred eighty-seven million, one hundred fifty-two thousand, eight hundred sixty-nine".