2001533231711 has 4 divisors (see below), whose sum is σ = 2155497326472. Its totient is φ = 1847569136952.

The previous prime is 2001533231647. The next prime is 2001533231743. The reversal of 2001533231711 is 1171323351002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001533231711 - 2⁶ = 2001533231647 is a prime.

It is a super-2 number, since 2×2001533231711² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001533231791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76982047361 + ... + 76982047386.

It is an arithmetic number, because the mean of its divisors is an integer number (538874331618).

Almost surely, 2^{2001533231711} is an apocalyptic number.

2001533231711 is a deficient number, since it is larger than the sum of its proper divisors (153964094761).

2001533231711 is a wasteful number, since it uses less digits than its factorization.

2001533231711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153964094760.

The product of its (nonzero) digits is 3780, while the sum is 29.

Adding to 2001533231711 its reverse (1171323351002), we get a palindrome (3172856582713).

The spelling of 2001533231711 in words is "two trillion, one billion, five hundred thirty-three million, two hundred thirty-one thousand, seven hundred eleven".