1377745664 has 18 divisors (see below), whose sum is σ = 2750110020. Its totient is φ = 688872704.

The previous prime is 1377745661. The next prime is 1377745669. The reversal of 1377745664 is 4665477731.

It is a super-2 number, since 2×1377745664² = 3796366229341601792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1377745661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2690654 + ... + 2691165.

It is an arithmetic number, because the mean of its divisors is an integer number (152783890).

Almost surely, 2^1377745664 is an apocalyptic number.

It is an amenable number.

1377745664 is a deficient number, since it is larger than the sum of its proper divisors (1372364356).

1377745664 is an frugal number, since it uses more digits than its factorization.

1377745664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381835 (or 5381821 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 50.

The square root of 1377745664 is about 37117.9964976560. The cubic root of 1377745664 is about 1112.7297109968.

The spelling of 1377745664 in words is "one billion, three hundred seventy-seven million, seven hundred forty-five thousand, six hundred sixty-four".