2001132645623 has 32 divisors (see below), whose sum is σ = 2165861376000. Its totient is φ = 1843237097856.

The previous prime is 2001132645593. The next prime is 2001132645643. The reversal of 2001132645623 is 3265462311002.

It is a cyclic number.

It is not a de Polignac number, because 2001132645623 - 2¹² = 2001132641527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001132645643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 566409965 + ... + 566413497.

It is an arithmetic number, because the mean of its divisors is an integer number (67683168000).

Almost surely, 2^{2001132645623} is an apocalyptic number.

2001132645623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2001132645623 is a deficient number, since it is larger than the sum of its proper divisors (164728730377).

2001132645623 is a wasteful number, since it uses less digits than its factorization.

2001132645623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5591.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 2001132645623 its reverse (3265462311002), we get a palindrome (5266594956625).

The spelling of 2001132645623 in words is "two trillion, one billion, one hundred thirty-two million, six hundred forty-five thousand, six hundred twenty-three".