61516709287 has 8 divisors (see below), whose sum is σ = 69273948672. Its totient is φ = 54120271800.

The previous prime is 61516709249. The next prime is 61516709297. The reversal of 61516709287 is 78290761516.

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

It is a cyclic number.

It is not a de Polignac number, because 61516709287 - 2¹⁹ = 61516184999 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 (61516709297) 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, 90200113 + ... + 90200794.

It is an arithmetic number, because the mean of its divisors is an integer number (8659243584).

Almost surely, 2^61516709287 is an apocalyptic number.

61516709287 is a deficient number, since it is larger than the sum of its proper divisors (7757239385).

61516709287 is a wasteful number, since it uses less digits than its factorization.

61516709287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180400949.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 61516709287 in words is "sixty-one billion, five hundred sixteen million, seven hundred nine thousand, two hundred eighty-seven".