2145715807849 has 4 divisors (see below), whose sum is σ = 2145818558464. Its totient is φ = 2145613057236.

The previous prime is 2145715807831. The next prime is 2145715807933. The reversal of 2145715807849 is 9487085175412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2145715807849 - 2⁷ = 2145715807721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145715807649) 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, 51343977 + ... + 51385750.

It is an arithmetic number, because the mean of its divisors is an integer number (536454639616).

Almost surely, 2^{2145715807849} is an apocalyptic number.

It is an amenable number.

2145715807849 is a deficient number, since it is larger than the sum of its proper divisors (102750615).

2145715807849 is a wasteful number, since it uses less digits than its factorization.

2145715807849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102750614.

The product of its (nonzero) digits is 22579200, while the sum is 61.

The spelling of 2145715807849 in words is "two trillion, one hundred forty-five billion, seven hundred fifteen million, eight hundred seven thousand, eight hundred forty-nine".