68121669 has 96 divisors (see below), whose sum is σ = 128701440. Its totient is φ = 31173120.

The previous prime is 68121649. The next prime is 68121679. The reversal of 68121669 is 96612186.

It is not a de Polignac number, because 68121669 - 2⁸ = 68121413 is a prime.

It is a super-2 number, since 2×68121669² = 9281123574691122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68121649) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 820702 + ... + 820784.

It is an arithmetic number, because the mean of its divisors is an integer number (1340640).

Almost surely, 2^68121669 is an apocalyptic number.

It is an amenable number.

68121669 is a deficient number, since it is larger than the sum of its proper divisors (60579771).

68121669 is a wasteful number, since it uses less digits than its factorization.

68121669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 140 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 68121669 is about 8253.5852209812. The cubic root of 68121669 is about 408.4088018592.

The spelling of 68121669 in words is "sixty-eight million, one hundred twenty-one thousand, six hundred sixty-nine".