11557392778 has 16 divisors (see below), whose sum is σ = 18746411904. Its totient is φ = 5323053760.

The previous prime is 11557392773. The next prime is 11557392799. The reversal of 11557392778 is 87729375511.

It is not an unprimeable number, because it can be changed into a prime (11557392773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3614608 + ... + 3617803.

It is an arithmetic number, because the mean of its divisors is an integer number (1171650744).

Almost surely, 2^11557392778 is an apocalyptic number.

11557392778 is a deficient number, since it is larger than the sum of its proper divisors (7189019126).

11557392778 is a wasteful number, since it uses less digits than its factorization.

11557392778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7232477.

The product of its digits is 3704400, while the sum is 55.

The spelling of 11557392778 in words is "eleven billion, five hundred fifty-seven million, three hundred ninety-two thousand, seven hundred seventy-eight".