11978261115 has 16 divisors (see below), whose sum is σ = 20292583968. Its totient is φ = 6012617216.

The previous prime is 11978261111. The next prime is 11978261129. The reversal of 11978261115 is 51116287911.

It is a cyclic number.

It is not a de Polignac number, because 11978261115 - 2² = 11978261111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11978261111) 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, 23486532 + ... + 23487041.

It is an arithmetic number, because the mean of its divisors is an integer number (1268286498).

Almost surely, 2^11978261115 is an apocalyptic number.

11978261115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11978261115 is a deficient number, since it is larger than the sum of its proper divisors (8314322853).

11978261115 is a wasteful number, since it uses less digits than its factorization.

11978261115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46973598.

The product of its digits is 30240, while the sum is 42.

The spelling of 11978261115 in words is "eleven billion, nine hundred seventy-eight million, two hundred sixty-one thousand, one hundred fifteen".