1991244608360 has 64 divisors (see below), whose sum is σ = 5142900021120. Its totient is φ = 679704871680.

The previous prime is 1991244608359. The next prime is 1991244608449. The reversal of 1991244608360 is 638064421991.

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, 15600731 + ... + 15727850.

It is an arithmetic number, because the mean of its divisors is an integer number (80357812830).

Almost surely, 2^{1991244608360} is an apocalyptic number.

1991244608360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1991244608360 is an abundant number, since it is smaller than the sum of its proper divisors (3151655412760).

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

1991244608360 is a wasteful number, since it uses less digits than its factorization.

1991244608360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31328826 (or 31328822 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 1991244608360 in words is "one trillion, nine hundred ninety-one billion, two hundred forty-four million, six hundred eight thousand, three hundred sixty".