1376661391168 has 84 divisors (see below), whose sum is σ = 3194289450372. Its totient is φ = 586940497920.

The previous prime is 1376661391109. The next prime is 1376661391169. The reversal of 1376661391168 is 8611931666731.

It can be written as a sum of positive squares in 2 ways, for example, as 119500193344 + 1257161197824 = 345688^2 + 1121232^2 .

It is a super-2 number, since 2×1376661391168² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1376661391169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532023 + ... + 1742518.

Almost surely, 2^{1376661391168} is an apocalyptic number.

It is an amenable number.

1376661391168 is an abundant number, since it is smaller than the sum of its proper divisors (1817628059204).

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

1376661391168 is a wasteful number, since it uses less digits than its factorization.

1376661391168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274760 (or 2274743 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 58.

The spelling of 1376661391168 in words is "one trillion, three hundred seventy-six billion, six hundred sixty-one million, three hundred ninety-one thousand, one hundred sixty-eight".