681662011 has 6 divisors (see below), whose sum is σ = 688103780. Its totient is φ = 675279996.

The previous prime is 681661979. The next prime is 681662041. The reversal of 681662011 is 110266186.

It is not a de Polignac number, because 681662011 - 2⁵ = 681661979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681662041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18321 + ... + 41218.

Almost surely, 2^681662011 is an apocalyptic number.

681662011 is a deficient number, since it is larger than the sum of its proper divisors (6441769).

681662011 is an equidigital number, since it uses as much as digits as its factorization.

681662011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59753 (or 59646 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 681662011 is about 26108.6577785990. The cubic root of 681662011 is about 880.0817808810.

The spelling of 681662011 in words is "six hundred eighty-one million, six hundred sixty-two thousand, eleven".