2115831640644 has 72 divisors (see below), whose sum is σ = 5584472449920. Its totient is φ = 674179853952.

The previous prime is 2115831640633. The next prime is 2115831640711. The reversal of 2115831640644 is 4460461385112.

2115831640644 is a `hidden beast` number, since 2 + 1 + 1 + 583 + 1 + 6 + 4 + 0 + 64 + 4 = 666.

It is a super-3 number, since 3×2115831640644³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2115831640644.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 471304 + ... + 2110400.

It is an arithmetic number, because the mean of its divisors is an integer number (77562117360).

Almost surely, 2^{2115831640644} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115831640644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2792236224960).

2115831640644 is an abundant number, since it is smaller than the sum of its proper divisors (3468640809276).

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

2115831640644 is a wasteful number, since it uses less digits than its factorization.

2115831640644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640689 (or 1640684 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 2115831640644 in words is "two trillion, one hundred fifteen billion, eight hundred thirty-one million, six hundred forty thousand, six hundred forty-four".