679745547898 has 4 divisors (see below), whose sum is σ = 1019618321850. Its totient is φ = 339872773948.

The previous prime is 679745547881. The next prime is 679745547919. The reversal of 679745547898 is 898745547976.

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., 376103772529 + 303641775369 = 613273^2 + 551037^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169936386973 + ... + 169936386976.

Almost surely, 2^679745547898 is an apocalyptic number.

679745547898 is a deficient number, since it is larger than the sum of its proper divisors (339872773952).

679745547898 is a wasteful number, since it uses less digits than its factorization.

679745547898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339872773951.

The product of its digits is 4267468800, while the sum is 79.

The spelling of 679745547898 in words is "six hundred seventy-nine billion, seven hundred forty-five million, five hundred forty-seven thousand, eight hundred ninety-eight".