64187212507 has 4 divisors (see below), whose sum is σ = 70022413656. Its totient is φ = 58352011360.

The previous prime is 64187212469. The next prime is 64187212541. The reversal of 64187212507 is 70521278146.

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

It is a cyclic number.

It is not a de Polignac number, because 64187212507 - 2²³ = 64178823899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64187212547) 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, 2917600558 + ... + 2917600579.

It is an arithmetic number, because the mean of its divisors is an integer number (17505603414).

Almost surely, 2^64187212507 is an apocalyptic number.

64187212507 is a deficient number, since it is larger than the sum of its proper divisors (5835201149).

64187212507 is a wasteful number, since it uses less digits than its factorization.

64187212507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5835201148.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 64187212507 in words is "sixty-four billion, one hundred eighty-seven million, two hundred twelve thousand, five hundred seven".