1945099908671 has 4 divisors (see below), whose sum is σ = 1990334790312. Its totient is φ = 1899865027032.

The previous prime is 1945099908643. The next prime is 1945099908677. The reversal of 1945099908671 is 1768099905491.

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

It is a cyclic number.

It is not a de Polignac number, because 1945099908671 - 2²⁶ = 1945032799807 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 (1945099908677) 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, 22617440756 + ... + 22617440841.

It is an arithmetic number, because the mean of its divisors is an integer number (497583697578).

Almost surely, 2^{1945099908671} is an apocalyptic number.

1945099908671 is a deficient number, since it is larger than the sum of its proper divisors (45234881641).

1945099908671 is an equidigital number, since it uses as much as digits as its factorization.

1945099908671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45234881640.

The product of its (nonzero) digits is 44089920, while the sum is 68.

The spelling of 1945099908671 in words is "one trillion, nine hundred forty-five billion, ninety-nine million, nine hundred eight thousand, six hundred seventy-one".