978568733691 has 16 divisors (see below), whose sum is σ = 1470150213120. Its totient is φ = 643190715720.

The previous prime is 978568733683. The next prime is 978568733741. The reversal of 978568733691 is 196337865879.

It is not a de Polignac number, because 978568733691 - 2³ = 978568733683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (978568733671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255232495 + ... + 255236328.

It is an arithmetic number, because the mean of its divisors is an integer number (91884388320).

Almost surely, 2^978568733691 is an apocalyptic number.

978568733691 is a deficient number, since it is larger than the sum of its proper divisors (491581479429).

978568733691 is a wasteful number, since it uses less digits than its factorization.

978568733691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510468903 (or 510468897 counting only the distinct ones).

The product of its digits is 411505920, while the sum is 72.

The spelling of 978568733691 in words is "nine hundred seventy-eight billion, five hundred sixty-eight million, seven hundred thirty-three thousand, six hundred ninety-one".