2157110720775 has 36 divisors (see below), whose sum is σ = 3863855070712. Its totient is φ = 1150390537920.

The previous prime is 2157110720773. The next prime is 2157110720777. The reversal of 2157110720775 is 5770270117512.

2157110720775 is a `hidden beast` number, since 2 + 1 + 571 + 1 + 0 + 7 + 2 + 0 + 7 + 75 = 666.

It is an interprime number because it is at equal distance from previous prime (2157110720773) and next prime (2157110720777).

It is not a de Polignac number, because 2157110720775 - 2¹ = 2157110720773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 2157110720775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157110720773) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3619512 + ... + 4173138.

Almost surely, 2^{2157110720775} is an apocalyptic number.

2157110720775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2157110720775 is a deficient number, since it is larger than the sum of its proper divisors (1706744349937).

2157110720775 is a wasteful number, since it uses less digits than its factorization.

2157110720775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570960 (or 570952 counting only the distinct ones).

The product of its (nonzero) digits is 240100, while the sum is 45.

The spelling of 2157110720775 in words is "two trillion, one hundred fifty-seven billion, one hundred ten million, seven hundred twenty thousand, seven hundred seventy-five".