72011666550 has 24 divisors (see below), whose sum is σ = 178588933416. Its totient is φ = 19203111040.

The previous prime is 72011666549. The next prime is 72011666591. The reversal of 72011666550 is 5566611027.

It is a junction number, because it is equal to n+sod(n) for n = 72011666499 and 72011666508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240038739 + ... + 240039038.

It is an arithmetic number, because the mean of its divisors is an integer number (7441205559).

Almost surely, 2^72011666550 is an apocalyptic number.

72011666550 is an abundant number, since it is smaller than the sum of its proper divisors (106577266866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72011666550 is a wasteful number, since it uses less digits than its factorization.

72011666550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480077792 (or 480077787 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 72011666550 in words is "seventy-two billion, eleven million, six hundred sixty-six thousand, five hundred fifty".