2145195503765 has 4 divisors (see below), whose sum is σ = 2574234604524. Its totient is φ = 1716156403008.

The previous prime is 2145195503687. The next prime is 2145195503809. The reversal of 2145195503765 is 5673055915412.

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 914429362564 + 1230766141201 = 956258^2 + 1109399^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145195503765 - 2²² = 2145191309461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214519550372 + ... + 214519550381.

It is an arithmetic number, because the mean of its divisors is an integer number (643558651131).

Almost surely, 2^{2145195503765} is an apocalyptic number.

It is an amenable number.

2145195503765 is a deficient number, since it is larger than the sum of its proper divisors (429039100759).

2145195503765 is an equidigital number, since it uses as much as digits as its factorization.

2145195503765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429039100758.

The product of its (nonzero) digits is 5670000, while the sum is 53.

The spelling of 2145195503765 in words is "two trillion, one hundred forty-five billion, one hundred ninety-five million, five hundred three thousand, seven hundred sixty-five".