869653187509 has 2 divisors, whose sum is σ = 869653187510. Its totient is φ = 869653187508.

The previous prime is 869653187477. The next prime is 869653187537. The reversal of 869653187509 is 905781356968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 590251085284 + 279402102225 = 768278^2 + 528585^2 .

It is a cyclic number.

It is not a de Polignac number, because 869653187509 - 2⁵ = 869653187477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869623187509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434826593754 + 434826593755.

It is an arithmetic number, because the mean of its divisors is an integer number (434826593755).

Almost surely, 2^869653187509 is an apocalyptic number.

It is an amenable number.

869653187509 is a deficient number, since it is larger than the sum of its proper divisors (1).

869653187509 is an equidigital number, since it uses as much as digits as its factorization.

869653187509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97977600, while the sum is 67.

The spelling of 869653187509 in words is "eight hundred sixty-nine billion, six hundred fifty-three million, one hundred eighty-seven thousand, five hundred nine".