68616007987 has 4 divisors (see below), whose sum is σ = 68634363160. Its totient is φ = 68597652816.

The previous prime is 68616007963. The next prime is 68616008023. The reversal of 68616007987 is 78970061686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68616007987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68616004987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9171978 + ... + 9179455.

It is an arithmetic number, because the mean of its divisors is an integer number (17158590790).

Almost surely, 2^68616007987 is an apocalyptic number.

68616007987 is a deficient number, since it is larger than the sum of its proper divisors (18355173).

68616007987 is a wasteful number, since it uses less digits than its factorization.

68616007987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18355172.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 68616007987 in words is "sixty-eight billion, six hundred sixteen million, seven thousand, nine hundred eighty-seven".