64999999999987 has 8 divisors (see below), whose sum is σ = 70142566198320. Its totient is φ = 59877800401440.

The previous prime is 64999999999933. The next prime is 64999999999993. The reversal of 64999999999987 is 78999999999946.

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 64999999999987 - 2³⁹ = 64450244186099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64999999969987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5091643312 + ... + 5091656077.

It is an arithmetic number, because the mean of its divisors is an integer number (8767820774790).

Almost surely, 2^{64999999999987} is an apocalyptic number.

64999999999987 is a deficient number, since it is larger than the sum of its proper divisors (5142566198333).

64999999999987 is a wasteful number, since it uses less digits than its factorization.

64999999999987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10183299893.

The product of its digits is 4686238234944, while the sum is 115.

The spelling of 64999999999987 in words is "sixty-four trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".