61616515 has 8 divisors (see below), whose sum is σ = 74053728. Its totient is φ = 49217280.

The previous prime is 61616497. The next prime is 61616531. The reversal of 61616515 is 51561616.

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

It is not a de Polignac number, because 61616515 - 2¹⁵ = 61583747 is a prime.

It is a Duffinian 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, 5791 + ... + 12520.

It is an arithmetic number, because the mean of its divisors is an integer number (9256716).

Almost surely, 2^61616515 is an apocalyptic number.

61616515 is a deficient number, since it is larger than the sum of its proper divisors (12437213).

61616515 is a wasteful number, since it uses less digits than its factorization.

61616515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18989.

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

The square root of 61616515 is about 7849.6187805523. The cubic root of 61616515 is about 394.9714555029.

The spelling of 61616515 in words is "sixty-one million, six hundred sixteen thousand, five hundred fifteen".