72271657511 has 4 divisors (see below), whose sum is σ = 72284066232. Its totient is φ = 72259248792.

The previous prime is 72271657501. The next prime is 72271657543. The reversal of 72271657511 is 11575617227.

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 72271657511 - 2³⁰ = 71197915687 is a prime.

It is a super-3 number, since 3×72271657511³ (a number of 34 digits) contains 333 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 (72271657501) 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, 6195620 + ... + 6207273.

It is an arithmetic number, because the mean of its divisors is an integer number (18071016558).

Almost surely, 2^72271657511 is an apocalyptic number.

72271657511 is a deficient number, since it is larger than the sum of its proper divisors (12408721).

72271657511 is a wasteful number, since it uses less digits than its factorization.

72271657511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12408720.

The product of its digits is 205800, while the sum is 44.

The spelling of 72271657511 in words is "seventy-two billion, two hundred seventy-one million, six hundred fifty-seven thousand, five hundred eleven".