11984371515985 has 16 divisors (see below), whose sum is σ = 15801499667520. Its totient is φ = 8653202187840.

The previous prime is 11984371515983. The next prime is 11984371515997. The reversal of 11984371515985 is 58951517348911.

It is not a de Polignac number, because 11984371515985 - 2¹ = 11984371515983 is a prime.

It is a super-2 number, since 2×11984371515985² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11984371515985.

It is not an unprimeable number, because it can be changed into a prime (11984371515983) 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, 783796902 + ... + 783812191.

It is an arithmetic number, because the mean of its divisors is an integer number (987593729220).

Almost surely, 2^{11984371515985} is an apocalyptic number.

It is an amenable number.

11984371515985 is a deficient number, since it is larger than the sum of its proper divisors (3817128151535).

11984371515985 is a wasteful number, since it uses less digits than its factorization.

11984371515985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567609248.

The product of its digits is 54432000, while the sum is 67.

The spelling of 11984371515985 in words is "eleven trillion, nine hundred eighty-four billion, three hundred seventy-one million, five hundred fifteen thousand, nine hundred eighty-five".