681166320 has 80 divisors (see below), whose sum is σ = 2114141472. Its totient is φ = 181427200.

The previous prime is 681166307. The next prime is 681166327. The reversal of 681166320 is 23661186.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681166327) 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, 357370 + ... + 359270.

Almost surely, 2^681166320 is an apocalyptic number.

681166320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681166320 is an abundant number, since it is smaller than the sum of its proper divisors (1432975152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681166320 is a wasteful number, since it uses less digits than its factorization.

681166320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410 (or 3404 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 681166320 is about 26099.1632049765. The cubic root of 681166320 is about 879.8684031868.

The spelling of 681166320 in words is "six hundred eighty-one million, one hundred sixty-six thousand, three hundred twenty".