64172061017 has 4 divisors (see below), whose sum is σ = 65051130420. Its totient is φ = 63292991616.

The previous prime is 64172061011. The next prime is 64172061067. The reversal of 64172061017 is 71016027146.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15470633161 + 48701427856 = 124381^2 + 220684^2 .

It is a cyclic number.

It is not a de Polignac number, because 64172061017 - 2⁸ = 64172060761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64172061011) 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, 439534592 + ... + 439534737.

It is an arithmetic number, because the mean of its divisors is an integer number (16262782605).

Almost surely, 2^64172061017 is an apocalyptic number.

It is an amenable number.

64172061017 is a deficient number, since it is larger than the sum of its proper divisors (879069403).

64172061017 is an equidigital number, since it uses as much as digits as its factorization.

64172061017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879069402.

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 64172061017 in words is "sixty-four billion, one hundred seventy-two million, sixty-one thousand, seventeen".