1081386491864 has 16 divisors (see below), whose sum is σ = 2317256768400. Its totient is φ = 463451353632.

The previous prime is 1081386491863. The next prime is 1081386491923. The reversal of 1081386491864 is 4681946831801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081386491863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9655236479 + ... + 9655236590.

It is an arithmetic number, because the mean of its divisors is an integer number (144828548025).

Almost surely, 2^{1081386491864} is an apocalyptic number.

1081386491864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1081386491864 is an abundant number, since it is smaller than the sum of its proper divisors (1235870276536).

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

1081386491864 is a wasteful number, since it uses less digits than its factorization.

1081386491864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19310473082 (or 19310473078 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 59.

The spelling of 1081386491864 in words is "one trillion, eighty-one billion, three hundred eighty-six million, four hundred ninety-one thousand, eight hundred sixty-four".