680948778971 has 4 divisors (see below), whose sum is σ = 695437050912. Its totient is φ = 666460507032.

The previous prime is 680948778967. The next prime is 680948778977. The reversal of 680948778971 is 179877849086.

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 680948778971 - 2² = 680948778967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680948778977) 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, 7244135900 + ... + 7244135993.

It is an arithmetic number, because the mean of its divisors is an integer number (173859262728).

Almost surely, 2^680948778971 is an apocalyptic number.

680948778971 is a deficient number, since it is larger than the sum of its proper divisors (14488271941).

680948778971 is a wasteful number, since it uses less digits than its factorization.

680948778971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14488271940.

The product of its (nonzero) digits is 341397504, while the sum is 74.

The spelling of 680948778971 in words is "six hundred eighty billion, nine hundred forty-eight million, seven hundred seventy-eight thousand, nine hundred seventy-one".