694123925881 has 9 divisors (see below), whose sum is σ = 718909612941. Its totient is φ = 670165290144.

The previous prime is 694123925861. The next prime is 694123925909. The reversal of 694123925881 is 188529321496.

It is a happy number.

The square root of 694123925881 is 833141.

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

It can be written as a sum of positive squares in 4 ways, for example, as 7910501481 + 686213424400 = 88941^2 + 828380^2 .

It is not a de Polignac number, because 694123925881 - 2²⁵ = 694090371449 is a prime.

It is a super-2 number, since 2×694123925881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (694123925851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24146725 + ... + 24175453.

Almost surely, 2^694123925881 is an apocalyptic number.

694123925881 is the 833141-st square number.

694123925881 is the 416571-st centered octagonal number.

It is an amenable number.

694123925881 is a deficient number, since it is larger than the sum of its proper divisors (24785687060).

694123925881 is an frugal number, since it uses more digits than its factorization.

694123925881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57516 (or 28758 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 58.

The spelling of 694123925881 in words is "six hundred ninety-four billion, one hundred twenty-three million, nine hundred twenty-five thousand, eight hundred eighty-one".