72278192611 has 4 divisors (see below), whose sum is σ = 72677519824. Its totient is φ = 71878865400.

The previous prime is 72278192603. The next prime is 72278192641. The reversal of 72278192611 is 11629187227.

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 72278192611 - 2³ = 72278192603 is a prime.

It is a super-2 number, since 2×72278192611² (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 (72278192641) 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, 199663335 + ... + 199663696.

It is an arithmetic number, because the mean of its divisors is an integer number (18169379956).

Almost surely, 2^72278192611 is an apocalyptic number.

72278192611 is a deficient number, since it is larger than the sum of its proper divisors (399327213).

72278192611 is a wasteful number, since it uses less digits than its factorization.

72278192611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399327212.

The product of its digits is 169344, while the sum is 46.

The spelling of 72278192611 in words is "seventy-two billion, two hundred seventy-eight million, one hundred ninety-two thousand, six hundred eleven".