1005646642326 has 160 divisors (see below), whose sum is σ = 2367061516512. Its totient is φ = 318823464960.

The previous prime is 1005646642291. The next prime is 1005646642387. The reversal of 1005646642326 is 6232466465001.

It is a happy number.

1005646642326 is a `hidden beast` number, since 1 + 0 + 0 + 564 + 6 + 64 + 2 + 3 + 26 = 666.

It is a super-2 number, since 2×1005646642326² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 43154710 + ... + 43178006.

Almost surely, 2^{1005646642326} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1005646642326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183530758256).

1005646642326 is an abundant number, since it is smaller than the sum of its proper divisors (1361414874186).

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

1005646642326 is a wasteful number, since it uses less digits than its factorization.

1005646642326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23516 (or 23507 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 1005646642326 in words is "one trillion, five billion, six hundred forty-six million, six hundred forty-two thousand, three hundred twenty-six".