68772661 has 4 divisors (see below), whose sum is σ = 68789952. Its totient is φ = 68755372.

The previous prime is 68772611. The next prime is 68772689. The reversal of 68772661 is 16627786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68772661 - 2¹¹ = 68770613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68772611) 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, 660 + ... + 11746.

It is an arithmetic number, because the mean of its divisors is an integer number (17197488).

Almost surely, 2^68772661 is an apocalyptic number.

It is an amenable number.

68772661 is a deficient number, since it is larger than the sum of its proper divisors (17291).

68772661 is a wasteful number, since it uses less digits than its factorization.

68772661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17290.

The product of its digits is 169344, while the sum is 43.

The square root of 68772661 is about 8292.9283730176. The cubic root of 68772661 is about 409.7056403906.

The spelling of 68772661 in words is "sixty-eight million, seven hundred seventy-two thousand, six hundred sixty-one".