1377689553 has 20 divisors (see below), whose sum is σ = 2066259888. Its totient is φ = 914787000.

The previous prime is 1377689549. The next prime is 1377689567. The reversal of 1377689553 is 3559867731.

1377689553 is a `hidden beast` number, since 1 + 3 + 7 + 7 + 6 + 89 + 553 = 666.

It is not a de Polignac number, because 1377689553 - 2² = 1377689549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377689553.

It is not an unprimeable number, because it can be changed into a prime (1377689953) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13551 + ... + 54212.

Almost surely, 2^1377689553 is an apocalyptic number.

It is an amenable number.

1377689553 is a deficient number, since it is larger than the sum of its proper divisors (688570335).

1377689553 is an equidigital number, since it uses as much as digits as its factorization.

1377689553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68026 (or 68017 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The square root of 1377689553 is about 37117.2406436685. The cubic root of 1377689553 is about 1112.7146048646.

The spelling of 1377689553 in words is "one billion, three hundred seventy-seven million, six hundred eighty-nine thousand, five hundred fifty-three".