61666577 has 8 divisors (see below), whose sum is σ = 70991616. Its totient is φ = 52470432.

The previous prime is 61666573. The next prime is 61666589. The reversal of 61666577 is 77566616.

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

It is not a de Polignac number, because 61666577 - 2² = 61666573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61666573) 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, 31193 + ... + 33110.

It is an arithmetic number, because the mean of its divisors is an integer number (8873952).

Almost surely, 2^61666577 is an apocalyptic number.

It is an amenable number.

61666577 is a deficient number, since it is larger than the sum of its proper divisors (9325039).

61666577 is a wasteful number, since it uses less digits than its factorization.

61666577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64447.

The product of its digits is 317520, while the sum is 44.

The square root of 61666577 is about 7852.8069503840. The cubic root of 61666577 is about 395.0783949512.

The spelling of 61666577 in words is "sixty-one million, six hundred sixty-six thousand, five hundred seventy-seven".