12177760661 has 4 divisors (see below), whose sum is σ = 13284829824. Its totient is φ = 11070691500.

The previous prime is 12177760643. The next prime is 12177760667. The reversal of 12177760661 is 16606777121.

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 not a de Polignac number, because 12177760661 - 2¹⁴ = 12177744277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12177760667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553534565 + ... + 553534586.

It is an arithmetic number, because the mean of its divisors is an integer number (3321207456).

Almost surely, 2^12177760661 is an apocalyptic number.

12177760661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12177760661 is a deficient number, since it is larger than the sum of its proper divisors (1107069163).

12177760661 is a wasteful number, since it uses less digits than its factorization.

12177760661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107069162.

The product of its (nonzero) digits is 148176, while the sum is 44.

The spelling of 12177760661 in words is "twelve billion, one hundred seventy-seven million, seven hundred sixty thousand, six hundred sixty-one".