2145578975 has 12 divisors (see below), whose sum is σ = 2746342080. Its totient is φ = 1661092800.

The previous prime is 2145578947. The next prime is 2145578983. The reversal of 2145578975 is 5798755412.

It is not a de Polignac number, because 2145578975 - 2¹⁴ = 2145562591 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1383470 + ... + 1385019.

It is an arithmetic number, because the mean of its divisors is an integer number (228861840).

Almost surely, 2^2145578975 is an apocalyptic number.

2145578975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2145578975 is a deficient number, since it is larger than the sum of its proper divisors (600763105).

2145578975 is a wasteful number, since it uses less digits than its factorization.

2145578975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768530 (or 2768525 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 53.

The square root of 2145578975 is about 46320.3948061758. The cubic root of 2145578975 is about 1289.7776142496. Note that the first 3 decimals are identical.

The spelling of 2145578975 in words is "two billion, one hundred forty-five million, five hundred seventy-eight thousand, nine hundred seventy-five".