669777111 has 6 divisors (see below), whose sum is σ = 967455840. Its totient is φ = 446518068.

The previous prime is 669777109. The next prime is 669777211. The reversal of 669777111 is 111777966.

It is not a de Polignac number, because 669777111 - 2¹ = 669777109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669777211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37209831 + ... + 37209848.

It is an arithmetic number, because the mean of its divisors is an integer number (161242640).

Almost surely, 2^669777111 is an apocalyptic number.

669777111 is a deficient number, since it is larger than the sum of its proper divisors (297678729).

669777111 is a wasteful number, since it uses less digits than its factorization.

669777111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74419685 (or 74419682 counting only the distinct ones).

The product of its digits is 111132, while the sum is 45.

The square root of 669777111 is about 25880.0523762994. The cubic root of 669777111 is about 874.9369689562.

It can be divided in two parts, 66977 and 7111, that added together give a cube (74088 = 42³).

The spelling of 669777111 in words is "six hundred sixty-nine million, seven hundred seventy-seven thousand, one hundred eleven".