857235871445 has 4 divisors (see below), whose sum is σ = 1028683045740. Its totient is φ = 685788697152.

The previous prime is 857235871441. The next prime is 857235871469. The reversal of 857235871445 is 544178532758.

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 466643370769 + 390592500676 = 683113^2 + 624974^2 .

It is a cyclic number.

It is not a de Polignac number, because 857235871445 - 2² = 857235871441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857235871441) 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, 85723587140 + ... + 85723587149.

It is an arithmetic number, because the mean of its divisors is an integer number (257170761435).

Almost surely, 2^857235871445 is an apocalyptic number.

It is an amenable number.

857235871445 is a deficient number, since it is larger than the sum of its proper divisors (171447174295).

857235871445 is a wasteful number, since it uses less digits than its factorization.

857235871445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171447174294.

The product of its digits is 37632000, while the sum is 59.

The spelling of 857235871445 in words is "eight hundred fifty-seven billion, two hundred thirty-five million, eight hundred seventy-one thousand, four hundred forty-five".