61666379 has 4 divisors (see below), whose sum is σ = 61906584. Its totient is φ = 61426176.

The previous prime is 61666351. The next prime is 61666393. The reversal of 61666379 is 97366616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61666379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61666349) 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, 119717 + ... + 120230.

It is an arithmetic number, because the mean of its divisors is an integer number (15476646).

Almost surely, 2^61666379 is an apocalyptic number.

61666379 is a deficient number, since it is larger than the sum of its proper divisors (240205).

61666379 is a wasteful number, since it uses less digits than its factorization.

61666379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240204.

The product of its digits is 244944, while the sum is 44.

The square root of 61666379 is about 7852.7943434169. The cubic root of 61666379 is about 395.0779721095.

The spelling of 61666379 in words is "sixty-one million, six hundred sixty-six thousand, three hundred seventy-nine".