61656815 has 8 divisors (see below), whose sum is σ = 80714448. Its totient is φ = 44841280.

The previous prime is 61656781. The next prime is 61656821. The reversal of 61656815 is 51865616.

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

It is not a de Polignac number, because 61656815 - 2⁸ = 61656559 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560462 + ... + 560571.

It is an arithmetic number, because the mean of its divisors is an integer number (10089306).

Almost surely, 2^61656815 is an apocalyptic number.

61656815 is a deficient number, since it is larger than the sum of its proper divisors (19057633).

61656815 is a wasteful number, since it uses less digits than its factorization.

61656815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121049.

The product of its digits is 43200, while the sum is 38.

The square root of 61656815 is about 7852.1853645976. The cubic root of 61656815 is about 395.0575464948.

The spelling of 61656815 in words is "sixty-one million, six hundred fifty-six thousand, eight hundred fifteen".