694609647638 has 8 divisors (see below), whose sum is σ = 1046386208088. Its totient is φ = 345814244944.

The previous prime is 694609647623. The next prime is 694609647679. The reversal of 694609647638 is 836746906496.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×694609647638⁴ (a number of 48 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745288856 + ... + 745289787.

It is an arithmetic number, because the mean of its divisors is an integer number (130798276011).

Almost surely, 2^694609647638 is an apocalyptic number.

694609647638 is a deficient number, since it is larger than the sum of its proper divisors (351776560450).

694609647638 is a wasteful number, since it uses less digits than its factorization.

694609647638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490578878.

The product of its (nonzero) digits is 282175488, while the sum is 68.

The spelling of 694609647638 in words is "six hundred ninety-four billion, six hundred nine million, six hundred forty-seven thousand, six hundred thirty-eight".