694681663 has 4 divisors (see below), whose sum is σ = 748118728. Its totient is φ = 641244600.

The previous prime is 694681649. The next prime is 694681703. The reversal of 694681663 is 366186496.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 694681663 - 2²¹ = 692584511 is a prime.

It is a super-2 number, since 2×694681663² = 965165225816891138, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694691663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26718513 + ... + 26718538.

It is an arithmetic number, because the mean of its divisors is an integer number (187029682).

Almost surely, 2^694681663 is an apocalyptic number.

694681663 is a deficient number, since it is larger than the sum of its proper divisors (53437065).

694681663 is a wasteful number, since it uses less digits than its factorization.

694681663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53437064.

The product of its digits is 1119744, while the sum is 49.

The square root of 694681663 is about 26356.8143560636. The cubic root of 694681663 is about 885.6496291054.

The spelling of 694681663 in words is "six hundred ninety-four million, six hundred eighty-one thousand, six hundred sixty-three".