64912140861 has 4 divisors (see below), whose sum is σ = 86549521152. Its totient is φ = 43274760572.

The previous prime is 64912140803. The next prime is 64912140869. The reversal of 64912140861 is 16804121946.

64912140861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64912140861 - 2¹³ = 64912132669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64912140869) 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, 10818690141 + ... + 10818690146.

It is an arithmetic number, because the mean of its divisors is an integer number (21637380288).

Almost surely, 2^64912140861 is an apocalyptic number.

It is an amenable number.

64912140861 is a deficient number, since it is larger than the sum of its proper divisors (21637380291).

64912140861 is a wasteful number, since it uses less digits than its factorization.

64912140861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21637380290.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 64912140861 in words is "sixty-four billion, nine hundred twelve million, one hundred forty thousand, eight hundred sixty-one".