64187894995489 has 4 divisors (see below), whose sum is σ = 66258472253440. Its totient is φ = 62117317737540.

The previous prime is 64187894995457. The next prime is 64187894995513. The reversal of 64187894995489 is 98459949878146.

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 64187894995489 - 2⁵ = 64187894995457 is a prime.

It is a super-2 number, since 2×64187894995489² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64187894995589) 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, 1035288628929 + ... + 1035288628990.

It is an arithmetic number, because the mean of its divisors is an integer number (16564618063360).

Almost surely, 2^{64187894995489} is an apocalyptic number.

It is an amenable number.

64187894995489 is a deficient number, since it is larger than the sum of its proper divisors (2070577257951).

64187894995489 is a wasteful number, since it uses less digits than its factorization.

64187894995489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070577257950.

The product of its digits is 45148078080, while the sum is 91.

The spelling of 64187894995489 in words is "sixty-four trillion, one hundred eighty-seven billion, eight hundred ninety-four million, nine hundred ninety-five thousand, four hundred eighty-nine".