1381531582866 has 32 divisors (see below), whose sum is σ = 2993633425728. Its totient is φ = 423342097920.

The previous prime is 1381531582853. The next prime is 1381531582877. The reversal of 1381531582866 is 6682851351831.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157488955 + ... + 157497726.

It is an arithmetic number, because the mean of its divisors is an integer number (93551044554).

Almost surely, 2^{1381531582866} is an apocalyptic number.

1381531582866 is an abundant number, since it is smaller than the sum of its proper divisors (1612101842862).

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

1381531582866 is a wasteful number, since it uses less digits than its factorization.

1381531582866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314986746.

The product of its digits is 8294400, while the sum is 57.

The spelling of 1381531582866 in words is "one trillion, three hundred eighty-one billion, five hundred thirty-one million, five hundred eighty-two thousand, eight hundred sixty-six".