11811857670 has 64 divisors (see below), whose sum is σ = 31527000000. Its totient is φ = 3146957568.

The previous prime is 11811857663. The next prime is 11811857741. The reversal of 11811857670 is 7675811811.

It is a happy number.

11811857670 is a `hidden beast` number, since 1 + 1 + 8 + 1 + 1 + 8 + 576 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285456 + ... + 324204.

It is an arithmetic number, because the mean of its divisors is an integer number (492609375).

Almost surely, 2^11811857670 is an apocalyptic number.

11811857670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11811857670 is an abundant number, since it is smaller than the sum of its proper divisors (19715142330).

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

11811857670 is a wasteful number, since it uses less digits than its factorization.

11811857670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39894 (or 39888 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 45.

The spelling of 11811857670 in words is "eleven billion, eight hundred eleven million, eight hundred fifty-seven thousand, six hundred seventy".