61656691 has 8 divisors (see below), whose sum is σ = 64997120. Its totient is φ = 58325832.

The previous prime is 61656677. The next prime is 61656701. The reversal of 61656691 is 19665616.

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 61656691 - 2⁵ = 61656659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61656611) 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, 13666 + ... + 17608.

It is an arithmetic number, because the mean of its divisors is an integer number (8124640).

Almost surely, 2^61656691 is an apocalyptic number.

61656691 is a deficient number, since it is larger than the sum of its proper divisors (3340429).

61656691 is a wasteful number, since it uses less digits than its factorization.

61656691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785.

The product of its digits is 58320, while the sum is 40.

The square root of 61656691 is about 7852.1774687026. The cubic root of 61656691 is about 395.0572816570.

The spelling of 61656691 in words is "sixty-one million, six hundred fifty-six thousand, six hundred ninety-one".