64172296291 has 4 divisors (see below), whose sum is σ = 64176502312. Its totient is φ = 64168090272.

The previous prime is 64172296283. The next prime is 64172296333. The reversal of 64172296291 is 19269227146.

It is a happy number.

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 64172296291 - 2³ = 64172296283 is a prime.

It is a super-2 number, since 2×64172296291² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64172296271) 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, 2080041 + ... + 2110666.

It is an arithmetic number, because the mean of its divisors is an integer number (16044125578).

Almost surely, 2^64172296291 is an apocalyptic number.

64172296291 is a deficient number, since it is larger than the sum of its proper divisors (4206021).

64172296291 is a wasteful number, since it uses less digits than its factorization.

64172296291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206020.

The product of its digits is 653184, while the sum is 49.

The spelling of 64172296291 in words is "sixty-four billion, one hundred seventy-two million, two hundred ninety-six thousand, two hundred ninety-one".