648173172361 has 16 divisors (see below), whose sum is σ = 761694776640. Its totient is φ = 543775389120.

The previous prime is 648173172359. The next prime is 648173172539. The reversal of 648173172361 is 163271371846.

It is a cyclic number.

It is not a de Polignac number, because 648173172361 - 2¹ = 648173172359 is a prime.

It is a super-2 number, since 2×648173172361² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648173172061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73291 + ... + 1140928.

It is an arithmetic number, because the mean of its divisors is an integer number (47605923540).

Almost surely, 2^648173172361 is an apocalyptic number.

It is an amenable number.

648173172361 is a deficient number, since it is larger than the sum of its proper divisors (113521604279).

648173172361 is a wasteful number, since it uses less digits than its factorization.

648173172361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217976.

The product of its digits is 1016064, while the sum is 49.

The spelling of 648173172361 in words is "six hundred forty-eight billion, one hundred seventy-three million, one hundred seventy-two thousand, three hundred sixty-one".