1377653666 has 8 divisors (see below), whose sum is σ = 2092638720. Its totient is φ = 680107428.

The previous prime is 1377653639. The next prime is 1377653677. The reversal of 1377653666 is 6663567731.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4359506 + ... + 4359821.

It is an arithmetic number, because the mean of its divisors is an integer number (261579840).

Almost surely, 2^1377653666 is an apocalyptic number.

1377653666 is a deficient number, since it is larger than the sum of its proper divisors (714985054).

1377653666 is an equidigital number, since it uses as much as digits as its factorization.

1377653666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8719408.

The product of its digits is 2857680, while the sum is 50.

The square root of 1377653666 is about 37116.7572128816. The cubic root of 1377653666 is about 1112.7049431969.

The spelling of 1377653666 in words is "one billion, three hundred seventy-seven million, six hundred fifty-three thousand, six hundred sixty-six".