857561178040 has 64 divisors (see below), whose sum is σ = 2226566684160. Its totient is φ = 291166392960.

The previous prime is 857561177983. The next prime is 857561178049. The reversal of 857561178040 is 40871165758.

It is a super-2 number, since 2×857561178040² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857561178049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14838726 + ... + 14896405.

It is an arithmetic number, because the mean of its divisors is an integer number (34790104440).

Almost surely, 2^857561178040 is an apocalyptic number.

It is an amenable number.

857561178040 is an abundant number, since it is smaller than the sum of its proper divisors (1369005506120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857561178040 is a wasteful number, since it uses less digits than its factorization.

857561178040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29735252 (or 29735248 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 857561178040 in words is "eight hundred fifty-seven billion, five hundred sixty-one million, one hundred seventy-eight thousand, forty".