1377777666 has 32 divisors (see below), whose sum is σ = 2903961600. Its totient is φ = 434581200.

The previous prime is 1377777641. The next prime is 1377777677. The reversal of 1377777666 is 6667777731.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98191 + ... + 111341.

It is an arithmetic number, because the mean of its divisors is an integer number (90748800).

Almost surely, 2^1377777666 is an apocalyptic number.

1377777666 is an abundant number, since it is smaller than the sum of its proper divisors (1526183934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1377777666 is a wasteful number, since it uses less digits than its factorization.

1377777666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14094.

The product of its digits is 10890936, while the sum is 57.

The square root of 1377777666 is about 37118.4275798423. The cubic root of 1377777666 is about 1112.7383263509.

The spelling of 1377777666 in words is "one billion, three hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred sixty-six".