2175217015657 has 6 divisors (see below), whose sum is σ = 2530354487658. Its totient is φ = 1864471727664.

The previous prime is 2175217015579. The next prime is 2175217015753. The reversal of 2175217015657 is 7565107125712.

It can be written as a sum of positive squares in only one way, i.e., 1597440682201 + 577776333456 = 1263899^2 + 760116^2 .

It is not a de Polignac number, because 2175217015657 - 2²³ = 2175208627049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 44392183993 = 2175217015657 / (2 + 1 + 7 + 5 + 2 + 1 + 7 + 0 + 1 + 5 + 6 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2175217015657.

It is not an unprimeable number, because it can be changed into a prime (2175217015357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22196091948 + ... + 22196092045.

It is an arithmetic number, because the mean of its divisors is an integer number (421725747943).

Almost surely, 2^{2175217015657} is an apocalyptic number.

It is an amenable number.

2175217015657 is a deficient number, since it is larger than the sum of its proper divisors (355137472001).

2175217015657 is an equidigital number, since it uses as much as digits as its factorization.

2175217015657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44392184007 (or 44392184000 counting only the distinct ones).

The product of its (nonzero) digits is 1029000, while the sum is 49.

The spelling of 2175217015657 in words is "two trillion, one hundred seventy-five billion, two hundred seventeen million, fifteen thousand, six hundred fifty-seven".