31857885345 has 32 divisors (see below), whose sum is σ = 59883917184. Its totient is φ = 14258073600.

The previous prime is 31857885343. The next prime is 31857885349. The reversal of 31857885345 is 54358875813.

It is not a de Polignac number, because 31857885345 - 2¹ = 31857885343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31857885343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7423936 + ... + 7428225.

It is an arithmetic number, because the mean of its divisors is an integer number (1871372412).

Almost surely, 2^31857885345 is an apocalyptic number.

It is an amenable number.

31857885345 is a deficient number, since it is larger than the sum of its proper divisors (28026031839).

31857885345 is a wasteful number, since it uses less digits than its factorization.

31857885345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14852193.

The product of its digits is 16128000, while the sum is 57.

The spelling of 31857885345 in words is "thirty-one billion, eight hundred fifty-seven million, eight hundred eighty-five thousand, three hundred forty-five".