1377653668 has 12 divisors (see below), whose sum is σ = 2424830940. Its totient is φ = 684844832.

The previous prime is 1377653639. The next prime is 1377653677. The reversal of 1377653668 is 8663567731.

It can be written as a sum of positive squares in 2 ways, for example, as 605258404 + 772395264 = 24602^2 + 27792^2 .

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, 994723 + ... + 996106.

It is an arithmetic number, because the mean of its divisors is an integer number (202069245).

Almost surely, 2^1377653668 is an apocalyptic number.

It is an amenable number.

1377653668 is a deficient number, since it is larger than the sum of its proper divisors (1047177272).

1377653668 is a wasteful number, since it uses less digits than its factorization.

1377653668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991006 (or 1991004 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 52.

The square root of 1377653668 is about 37116.7572398236. The cubic root of 1377653668 is about 1112.7049437354.

The spelling of 1377653668 in words is "one billion, three hundred seventy-seven million, six hundred fifty-three thousand, six hundred sixty-eight".