61615615 has 8 divisors (see below), whose sum is σ = 74176848. Its totient is φ = 49133760.

The previous prime is 61615573. The next prime is 61615663. The reversal of 61615615 is 51651616.

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

It is not a de Polignac number, because 61615615 - 2⁷ = 61615487 is a prime.

It is a Duffinian number.

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, 18121 + ... + 21250.

It is an arithmetic number, because the mean of its divisors is an integer number (9272106).

Almost surely, 2^61615615 is an apocalyptic number.

61615615 is a deficient number, since it is larger than the sum of its proper divisors (12561233).

61615615 is a wasteful number, since it uses less digits than its factorization.

61615615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39689.

The product of its digits is 5400, while the sum is 31.

The square root of 61615615 is about 7849.5614527182. The cubic root of 61615615 is about 394.9695324468.

The spelling of 61615615 in words is "sixty-one million, six hundred fifteen thousand, six hundred fifteen".