1981006023864 has 64 divisors (see below), whose sum is σ = 5678100483840. Its totient is φ = 564193393920.

The previous prime is 1981006023851. The next prime is 1981006023869. The reversal of 1981006023864 is 4683206001891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981006023869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18784002 + ... + 18889169.

It is an arithmetic number, because the mean of its divisors is an integer number (88720320060).

Almost surely, 2^{1981006023864} is an apocalyptic number.

1981006023864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1981006023864 is an abundant number, since it is smaller than the sum of its proper divisors (3697094459976).

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

1981006023864 is a wasteful number, since it uses less digits than its factorization.

1981006023864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37673500 (or 37673496 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 1981006023864 in words is "one trillion, nine hundred eighty-one billion, six million, twenty-three thousand, eight hundred sixty-four".