12264777891 has 24 divisors (see below), whose sum is σ = 19452639024. Its totient is φ = 7695544320.

The previous prime is 12264777883. The next prime is 12264777911. The reversal of 12264777891 is 19877746221.

12264777891 is a `hidden beast` number, since 12 + 2 + 6 + 477 + 78 + 91 = 666.

It is not a de Polignac number, because 12264777891 - 2³ = 12264777883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12264777851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1480350 + ... + 1488611.

It is an arithmetic number, because the mean of its divisors is an integer number (810526626).

Almost surely, 2^12264777891 is an apocalyptic number.

12264777891 is a deficient number, since it is larger than the sum of its proper divisors (7187861133).

12264777891 is an equidigital number, since it uses as much as digits as its factorization.

12264777891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968993 (or 2968981 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The spelling of 12264777891 in words is "twelve billion, two hundred sixty-four million, seven hundred seventy-seven thousand, eight hundred ninety-one".