1381081865790 has 64 divisors (see below), whose sum is σ = 3616754084352. Its totient is φ = 334730812800.

The previous prime is 1381081865759. The next prime is 1381081865827. The reversal of 1381081865790 is 975681801831.

It is a self number, because there is not a number n which added to its sum of digits gives 1381081865790.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 964575 + ... + 1921605.

It is an arithmetic number, because the mean of its divisors is an integer number (56511782568).

Almost surely, 2^{1381081865790} is an apocalyptic number.

1381081865790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1381081865790 is an abundant number, since it is smaller than the sum of its proper divisors (2235672218562).

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

1381081865790 is a wasteful number, since it uses less digits than its factorization.

1381081865790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961425.

The product of its (nonzero) digits is 2903040, while the sum is 57.

The spelling of 1381081865790 in words is "one trillion, three hundred eighty-one billion, eighty-one million, eight hundred sixty-five thousand, seven hundred ninety".