694400556249 has 27 divisors (see below), whose sum is σ = 1014744710109. Its totient is φ = 457585539840.

The previous prime is 694400556217. The next prime is 694400556277. The reversal of 694400556249 is 942655004496.

The square root of 694400556249 is 833307.

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

694400556249 is a `hidden beast` number, since 6 + 9 + 4 + 4 + 0 + 0 + 5 + 5 + 624 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 546944556249 + 147456000000 = 739557^2 + 384000^2 .

It is not a de Polignac number, because 694400556249 - 2⁵ = 694400556217 is a prime.

It is a super-2 number, since 2×694400556249² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 694400556195 and 694400556204.

It is not an unprimeable number, because it can be changed into a prime (694400556209) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 222491409 + ... + 222494529.

Almost surely, 2^694400556249 is an apocalyptic number.

694400556249 is the 833307-th square number.

694400556249 is the 416654-th centered octagonal number.

It is an amenable number.

694400556249 is a deficient number, since it is larger than the sum of its proper divisors (320344153860).

694400556249 is an frugal number, since it uses more digits than its factorization.

694400556249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6426 (or 3213 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The spelling of 694400556249 in words is "six hundred ninety-four billion, four hundred million, five hundred fifty-six thousand, two hundred forty-nine".