68601681 has 16 divisors (see below), whose sum is σ = 107611200. Its totient is φ = 43043904.

The previous prime is 68601671. The next prime is 68601683. The reversal of 68601681 is 18610686.

It is not a de Polignac number, because 68601681 - 2⁵ = 68601649 is a prime.

It is a super-2 number, since 2×68601681² = 9412381272051522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68601683) 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, 74271 + ... + 75188.

It is an arithmetic number, because the mean of its divisors is an integer number (6725700).

Almost surely, 2^68601681 is an apocalyptic number.

It is an amenable number.

68601681 is a deficient number, since it is larger than the sum of its proper divisors (39009519).

68601681 is a wasteful number, since it uses less digits than its factorization.

68601681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149485 (or 149479 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 68601681 is about 8282.6131745965. The cubic root of 68601681 is about 409.3658270462.

The spelling of 68601681 in words is "sixty-eight million, six hundred one thousand, six hundred eighty-one".