1381477621864 has 16 divisors (see below), whose sum is σ = 2592711905220. Its totient is φ = 690087780480.

The previous prime is 1381477621859. The next prime is 1381477621903. The reversal of 1381477621864 is 4681267741831.

It can be written as a sum of positive squares in 2 ways, for example, as 1160726116900 + 220751504964 = 1077370^2 + 469842^2 .

It is a super-2 number, since 2×1381477621864² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1381477621799 and 1381477621808.

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, 81369789 + ... + 81386764.

Almost surely, 2^{1381477621864} is an apocalyptic number.

It is an amenable number.

1381477621864 is a deficient number, since it is larger than the sum of its proper divisors (1211234283356).

1381477621864 is a wasteful number, since it uses less digits than its factorization.

1381477621864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162757620 (or 162757616 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 58.

The spelling of 1381477621864 in words is "one trillion, three hundred eighty-one billion, four hundred seventy-seven million, six hundred twenty-one thousand, eight hundred sixty-four".