11958857785 has 16 divisors (see below), whose sum is σ = 16442899200. Its totient is φ = 8179269696.

The previous prime is 11958857767. The next prime is 11958857851. The reversal of 11958857785 is 58775885911.

It is a cyclic number.

It is not a de Polignac number, because 11958857785 - 2⁷ = 11958857657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425565 + ... + 452794.

It is an arithmetic number, because the mean of its divisors is an integer number (1027681200).

Almost surely, 2^11958857785 is an apocalyptic number.

It is an amenable number.

11958857785 is a deficient number, since it is larger than the sum of its proper divisors (4484041415).

11958857785 is an equidigital number, since it uses as much as digits as its factorization.

11958857785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878760.

The product of its digits is 28224000, while the sum is 64.

The spelling of 11958857785 in words is "eleven billion, nine hundred fifty-eight million, eight hundred fifty-seven thousand, seven hundred eighty-five".