1223661777 has 8 divisors (see below), whose sum is σ = 1757052864. Its totient is φ = 753022608.

The previous prime is 1223661773. The next prime is 1223661797. The reversal of 1223661777 is 7771663221.

1223661777 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1223661777 - 2² = 1223661773 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1223661773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15687933 + ... + 15688010.

It is an arithmetic number, because the mean of its divisors is an integer number (219631608).

Almost surely, 2^1223661777 is an apocalyptic number.

It is an amenable number.

1223661777 is a deficient number, since it is larger than the sum of its proper divisors (533391087).

1223661777 is a wasteful number, since it uses less digits than its factorization.

1223661777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31375959.

The product of its digits is 148176, while the sum is 42.

The square root of 1223661777 is about 34980.8773046074. The cubic root of 1223661777 is about 1069.5977108830.

The spelling of 1223661777 in words is "one billion, two hundred twenty-three million, six hundred sixty-one thousand, seven hundred seventy-seven".