61656403015 has 8 divisors (see below), whose sum is σ = 74552475888. Its totient is φ = 48948594240.

The previous prime is 61656403013. The next prime is 61656403111. The reversal of 61656403015 is 51030465616.

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

It is not a de Polignac number, because 61656403015 - 2¹ = 61656403013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656403013) 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, 47065302 + ... + 47066611.

It is an arithmetic number, because the mean of its divisors is an integer number (9319059486).

Almost surely, 2^61656403015 is an apocalyptic number.

61656403015 is a deficient number, since it is larger than the sum of its proper divisors (12896072873).

61656403015 is a wasteful number, since it uses less digits than its factorization.

61656403015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94132049.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 61656403015 in words is "sixty-one billion, six hundred fifty-six million, four hundred three thousand, fifteen".