12261779998 has 32 divisors (see below), whose sum is σ = 20916030240. Its totient is φ = 5344444800.

The previous prime is 12261779977. The next prime is 12261780019. The reversal of 12261779998 is 89997716221.

It is an interprime number because it is at equal distance from previous prime (12261779977) and next prime (12261780019).

It is a congruent number.

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, 117448 + ... + 195748.

It is an arithmetic number, because the mean of its divisors is an integer number (653625945).

Almost surely, 2^12261779998 is an apocalyptic number.

12261779998 is a deficient number, since it is larger than the sum of its proper divisors (8654250242).

12261779998 is a wasteful number, since it uses less digits than its factorization.

12261779998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78652.

The product of its digits is 6858432, while the sum is 61.

The spelling of 12261779998 in words is "twelve billion, two hundred sixty-one million, seven hundred seventy-nine thousand, nine hundred ninety-eight".