64894799049 has 4 divisors (see below), whose sum is σ = 86526398736. Its totient is φ = 43263199364.

The previous prime is 64894799029. The next prime is 64894799071. The reversal of 64894799049 is 94099749846.

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 64894799049 - 2²⁴ = 64878021833 is a prime.

It is a super-2 number, since 2×64894799049² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64894799009) 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, 10815799839 + ... + 10815799844.

It is an arithmetic number, because the mean of its divisors is an integer number (21631599684).

Almost surely, 2^64894799049 is an apocalyptic number.

It is an amenable number.

64894799049 is a deficient number, since it is larger than the sum of its proper divisors (21631599687).

64894799049 is a wasteful number, since it uses less digits than its factorization.

64894799049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21631599686.

The product of its (nonzero) digits is 141087744, while the sum is 69.

The spelling of 64894799049 in words is "sixty-four billion, eight hundred ninety-four million, seven hundred ninety-nine thousand, forty-nine".