1945215705161 has 4 divisors (see below), whose sum is σ = 1945554421632. Its totient is φ = 1944876988692.

The previous prime is 1945215705127. The next prime is 1945215705187. The reversal of 1945215705161 is 1615075125491.

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 1945215705161 - 2²⁶ = 1945148596297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1945215705061) 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, 169349621 + ... + 169361106.

It is an arithmetic number, because the mean of its divisors is an integer number (486388605408).

Almost surely, 2^{1945215705161} is an apocalyptic number.

It is an amenable number.

1945215705161 is a deficient number, since it is larger than the sum of its proper divisors (338716471).

1945215705161 is an equidigital number, since it uses as much as digits as its factorization.

1945215705161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338716470.

The product of its (nonzero) digits is 378000, while the sum is 47.

The spelling of 1945215705161 in words is "one trillion, nine hundred forty-five billion, two hundred fifteen million, seven hundred five thousand, one hundred sixty-one".