891290785345 has 16 divisors (see below), whose sum is σ = 1071145986768. Its totient is φ = 711968481280.

The previous prime is 891290785339. The next prime is 891290785421. The reversal of 891290785345 is 543587092198.

It can be written as a sum of positive squares in 8 ways, for example, as 160101616129 + 731189169216 = 400127^2 + 855096^2 .

It is not a de Polignac number, because 891290785345 - 2³ = 891290785337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13769697 + ... + 13834273.

It is an arithmetic number, because the mean of its divisors is an integer number (66946624173).

Almost surely, 2^891290785345 is an apocalyptic number.

It is an amenable number.

891290785345 is a deficient number, since it is larger than the sum of its proper divisors (179855201423).

891290785345 is a wasteful number, since it uses less digits than its factorization.

891290785345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68660.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 891290785345 in words is "eight hundred ninety-one billion, two hundred ninety million, seven hundred eighty-five thousand, three hundred forty-five".