1215809164869 has 16 divisors (see below), whose sum is σ = 1805976480000. Its totient is φ = 722390590656.

The previous prime is 1215809164861. The next prime is 1215809164919. The reversal of 1215809164869 is 9684619085121.

It is not a de Polignac number, because 1215809164869 - 2³ = 1215809164861 is a prime.

It is a super-2 number, since 2×1215809164869² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215809164861) 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, 537491869 + ... + 537494130.

It is an arithmetic number, because the mean of its divisors is an integer number (112873530000).

Almost surely, 2^{1215809164869} is an apocalyptic number.

It is an amenable number.

1215809164869 is a deficient number, since it is larger than the sum of its proper divisors (590167315131).

1215809164869 is a wasteful number, since it uses less digits than its factorization.

1215809164869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074986044.

The product of its (nonzero) digits is 7464960, while the sum is 60.

The spelling of 1215809164869 in words is "one trillion, two hundred fifteen billion, eight hundred nine million, one hundred sixty-four thousand, eight hundred sixty-nine".