2145640747185 has 48 divisors (see below), whose sum is σ = 4005520790544. Its totient is φ = 1056229802496.

The previous prime is 2145640747169. The next prime is 2145640747213. The reversal of 2145640747185 is 5817470465412.

It is a happy number.

2145640747185 is a `hidden beast` number, since 2 + 1 + 4 + 56 + 40 + 7 + 471 + 85 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 210339642384 + 1935301104801 = 458628^2 + 1391151^2 .

It is not a de Polignac number, because 2145640747185 - 2⁴ = 2145640747169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7400167 + ... + 7684643.

It is an arithmetic number, because the mean of its divisors is an integer number (83448349803).

Almost surely, 2^{2145640747185} is an apocalyptic number.

It is an amenable number.

2145640747185 is a deficient number, since it is larger than the sum of its proper divisors (1859880043359).

2145640747185 is a wasteful number, since it uses less digits than its factorization.

2145640747185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297394 (or 297391 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 54.

The spelling of 2145640747185 in words is "two trillion, one hundred forty-five billion, six hundred forty million, seven hundred forty-seven thousand, one hundred eighty-five".