857952459581 has 12 divisors (see below), whose sum is σ = 1025000017308. Its totient is φ = 715512474432.

The previous prime is 857952459569. The next prime is 857952459593. The reversal of 857952459581 is 185954259758.

It is an interprime number because it is at equal distance from previous prime (857952459569) and next prime (857952459593).

It can be written as a sum of positive squares in 2 ways, for example, as 456896235481 + 401056224100 = 675941^2 + 633290^2 .

It is not a de Polignac number, because 857952459581 - 2⁶ = 857952459517 is a prime.

It is a super-2 number, since 2×857952459581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857952458581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236609456 + ... + 236613081.

It is an arithmetic number, because the mean of its divisors is an integer number (85416668109).

Almost surely, 2^857952459581 is an apocalyptic number.

It is an amenable number.

857952459581 is a deficient number, since it is larger than the sum of its proper divisors (167047557727).

857952459581 is a wasteful number, since it uses less digits than its factorization.

857952459581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473222588 (or 473222581 counting only the distinct ones).

The product of its digits is 181440000, while the sum is 68.

The spelling of 857952459581 in words is "eight hundred fifty-seven billion, nine hundred fifty-two million, four hundred fifty-nine thousand, five hundred eighty-one".