61656116287 has 8 divisors (see below), whose sum is σ = 64228926080. Its totient is φ = 59119800480.

The previous prime is 61656116237. The next prime is 61656116293. The reversal of 61656116287 is 78261165616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61656116287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61656116287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656116237) 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, 9120048 + ... + 9126805.

It is an arithmetic number, because the mean of its divisors is an integer number (8028615760).

Almost surely, 2^61656116287 is an apocalyptic number.

61656116287 is a deficient number, since it is larger than the sum of its proper divisors (2572809793).

61656116287 is a wasteful number, since it uses less digits than its factorization.

61656116287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18246993.

The product of its digits is 725760, while the sum is 49.

The spelling of 61656116287 in words is "sixty-one billion, six hundred fifty-six million, one hundred sixteen thousand, two hundred eighty-seven".