1216038243864 has 32 divisors (see below), whose sum is σ = 3040123072320. Its totient is φ = 405342419616.

The previous prime is 1216038243821. The next prime is 1216038243869. The reversal of 1216038243864 is 4683428306121.

It is a super-2 number, since 2×1216038243864² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216038243869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4366047 + ... + 4636209.

It is an arithmetic number, because the mean of its divisors is an integer number (95003846010).

Almost surely, 2^{1216038243864} is an apocalyptic number.

It is an amenable number.

1216038243864 is an abundant number, since it is smaller than the sum of its proper divisors (1824084828456).

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

1216038243864 is a wasteful number, since it uses less digits than its factorization.

1216038243864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457719 (or 457715 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 1216038243864 in words is "one trillion, two hundred sixteen billion, thirty-eight million, two hundred forty-three thousand, eight hundred sixty-four".