72473555918 has 4 divisors (see below), whose sum is σ = 108710333880. Its totient is φ = 36236777958.

The previous prime is 72473555911. The next prime is 72473555927. The reversal of 72473555918 is 81955537427.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72473555911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18118388978 + ... + 18118388981.

It is an arithmetic number, because the mean of its divisors is an integer number (27177583470).

Almost surely, 2^72473555918 is an apocalyptic number.

72473555918 is a deficient number, since it is larger than the sum of its proper divisors (36236777962).

72473555918 is a wasteful number, since it uses less digits than its factorization.

72473555918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36236777961.

The product of its digits is 10584000, while the sum is 56.

The spelling of 72473555918 in words is "seventy-two billion, four hundred seventy-three million, five hundred fifty-five thousand, nine hundred eighteen".