12277990781 has 4 divisors (see below), whose sum is σ = 14031989472. Its totient is φ = 10523992092.

The previous prime is 12277990763. The next prime is 12277990787. The reversal of 12277990781 is 18709977221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12277990781 is a prime.

It is a super-2 number, since 2×12277990781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12277990787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876999335 + ... + 876999348.

It is an arithmetic number, because the mean of its divisors is an integer number (3507997368).

Almost surely, 2^12277990781 is an apocalyptic number.

It is an amenable number.

12277990781 is a deficient number, since it is larger than the sum of its proper divisors (1753998691).

12277990781 is an equidigital number, since it uses as much as digits as its factorization.

12277990781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753998690.

The product of its (nonzero) digits is 889056, while the sum is 53.

The spelling of 12277990781 in words is "twelve billion, two hundred seventy-seven million, nine hundred ninety thousand, seven hundred eighty-one".