72003123011 has 4 divisors (see below), whose sum is σ = 72006318072. Its totient is φ = 71999927952.

The previous prime is 72003122977. The next prime is 72003123037. The reversal of 72003123011 is 11032130027.

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 72003123011 - 2²² = 71998928707 is a prime.

It is a super-2 number, since 2×72003123011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72003123211) 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, 1563485 + ... + 1608878.

It is an arithmetic number, because the mean of its divisors is an integer number (18001579518).

Almost surely, 2^72003123011 is an apocalyptic number.

72003123011 is a deficient number, since it is larger than the sum of its proper divisors (3195061).

72003123011 is a wasteful number, since it uses less digits than its factorization.

72003123011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195060.

The product of its (nonzero) digits is 252, while the sum is 20.

Adding to 72003123011 its reverse (11032130027), we get a palindrome (83035253038).

The spelling of 72003123011 in words is "seventy-two billion, three million, one hundred twenty-three thousand, eleven".