691882922025 has 81 divisors (see below), whose sum is σ = 1295999297047. Its totient is φ = 352814167200.

The previous prime is 691882922011. The next prime is 691882922039. The reversal of 691882922025 is 520229288196.

It is a happy number.

The square root of 691882922025 is 831795.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (691882922011) and next prime (691882922039).

It can be written as a sum of positive squares in only one way, i.e., 249077851929 + 442805070096 = 499077^2 + 665436^2 .

It is not a de Polignac number, because 691882922025 - 2²³ = 691874533417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 286968070 + ... + 286970480.

Almost surely, 2^691882922025 is an apocalyptic number.

691882922025 is the 831795-th square number.

691882922025 is the 415898-th centered octagonal number.

It is an amenable number.

691882922025 is a deficient number, since it is larger than the sum of its proper divisors (604116375022).

691882922025 is an equidigital number, since it uses as much as digits as its factorization.

691882922025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884 (or 2442 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 691882922025 in words is "six hundred ninety-one billion, eight hundred eighty-two million, nine hundred twenty-two thousand, twenty-five".