2145780501757 has 4 divisors (see below), whose sum is σ = 2180957231356. Its totient is φ = 2110603772160.

The previous prime is 2145780501743. The next prime is 2145780501779. The reversal of 2145780501757 is 7571050875412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1135234844676 + 1010545657081 = 1065474^2 + 1005259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145780501757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145780501797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17588364708 + ... + 17588364829.

It is an arithmetic number, because the mean of its divisors is an integer number (545239307839).

Almost surely, 2^{2145780501757} is an apocalyptic number.

It is an amenable number.

2145780501757 is a deficient number, since it is larger than the sum of its proper divisors (35176729599).

2145780501757 is an equidigital number, since it uses as much as digits as its factorization.

2145780501757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35176729598.

The product of its (nonzero) digits is 2744000, while the sum is 52.

The spelling of 2145780501757 in words is "two trillion, one hundred forty-five billion, seven hundred eighty million, five hundred one thousand, seven hundred fifty-seven".