2691287318412 has 216 divisors, whose sum is σ = 8637403686912. Its totient is φ = 698686430400.

The previous prime is 2691287318347. The next prime is 2691287318437. The reversal of 2691287318412 is 2148137821962.

2691287318412 is a `hidden beast` number, since 2 + 6 + 9 + 1 + 287 + 318 + 41 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39996837 + ... + 40064067.

It is an arithmetic number, because the mean of its divisors is an integer number (39987980032).

Almost surely, 2^{2691287318412} is an apocalyptic number.

2691287318412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2691287318412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4318701843456).

2691287318412 is an abundant number, since it is smaller than the sum of its proper divisors (5946116368500).

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

2691287318412 is a wasteful number, since it uses less digits than its factorization.

2691287318412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69329 (or 69317 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 2691287318412 in words is "two trillion, six hundred ninety-one billion, two hundred eighty-seven million, three hundred eighteen thousand, four hundred twelve".