693681921216964 has 9 divisors (see below), whose sum is σ = 1213943454312141. Its totient is φ = 346840934270640.

The previous prime is 693681921216943. The next prime is 693681921217007. The reversal of 693681921216964 is 469612129186396.

It is a happy number.

The square root of 693681921216964 is 26337842.

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

It can be written as a sum of positive squares in only one way, i.e., 666643585191364 + 27038336025600 = 25819442^2 + 5199840^2 .

It is a super-2 number, since 2×693681921216964² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 46091224 + ... + 59260144.

Almost surely, 2^{693681921216964} is an apocalyptic number.

693681921216964 is the 26337842-nd square number.

It is an amenable number.

693681921216964 is a deficient number, since it is larger than the sum of its proper divisors (520261533095177).

693681921216964 is an frugal number, since it uses more digits than its factorization.

693681921216964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26337846 (or 13168923 counting only the distinct ones).

The product of its digits is 362797056, while the sum is 73.

The spelling of 693681921216964 in words is "six hundred ninety-three trillion, six hundred eighty-one billion, nine hundred twenty-one million, two hundred sixteen thousand, nine hundred sixty-four".