693978445634 has 4 divisors (see below), whose sum is σ = 1040967668454. Its totient is φ = 346989222816.

The previous prime is 693978445627. The next prime is 693978445637. The reversal of 693978445634 is 436544879396.

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

It can be written as a sum of positive squares in only one way, i.e., 473873908225 + 220104537409 = 688385^2 + 469153^2 .

It is not an unprimeable number, because it can be changed into a prime (693978445637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173494611407 + ... + 173494611410.

Almost surely, 2^693978445634 is an apocalyptic number.

693978445634 is a deficient number, since it is larger than the sum of its proper divisors (346989222820).

693978445634 is a wasteful number, since it uses less digits than its factorization.

693978445634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346989222819.

The product of its digits is 470292480, while the sum is 68.

The spelling of 693978445634 in words is "six hundred ninety-three billion, nine hundred seventy-eight million, four hundred forty-five thousand, six hundred thirty-four".