2117257945 has 32 divisors (see below), whose sum is σ = 2942562816. Its totient is φ = 1445376000.

The previous prime is 2117257943. The next prime is 2117257973. The reversal of 2117257945 is 5497527112.

It is not a de Polignac number, because 2117257945 - 2¹ = 2117257943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2117257943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372112 + ... + 377758.

It is an arithmetic number, because the mean of its divisors is an integer number (91955088).

Almost surely, 2^2117257945 is an apocalyptic number.

It is an amenable number.

2117257945 is a deficient number, since it is larger than the sum of its proper divisors (825304871).

2117257945 is a wasteful number, since it uses less digits than its factorization.

2117257945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081.

The product of its digits is 176400, while the sum is 43.

The square root of 2117257945 is about 46013.6712836522. The cubic root of 2117257945 is about 1284.0775617284.

It can be divided in two parts, 2117 and 257945, that added together give a palindrome (260062).

The spelling of 2117257945 in words is "two billion, one hundred seventeen million, two hundred fifty-seven thousand, nine hundred forty-five".