61668931 has 8 divisors (see below), whose sum is σ = 62346240. Its totient is φ = 60995592.

The previous prime is 61668907. The next prime is 61668947. The reversal of 61668931 is 13986616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61668931 - 2²³ = 53280323 is a prime.

It is a super-2 number, since 2×61668931² = 7606114101365522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61668991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38166 + ... + 39748.

It is an arithmetic number, because the mean of its divisors is an integer number (7793280).

Almost surely, 2^61668931 is an apocalyptic number.

61668931 is a deficient number, since it is larger than the sum of its proper divisors (677309).

61668931 is a wasteful number, since it uses less digits than its factorization.

61668931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985.

The product of its digits is 46656, while the sum is 40.

The square root of 61668931 is about 7852.9568316654. The cubic root of 61668931 is about 395.0834220002.

The spelling of 61668931 in words is "sixty-one million, six hundred sixty-eight thousand, nine hundred thirty-one".