72155987143 has 4 divisors (see below), whose sum is σ = 73691220960. Its totient is φ = 70620753328.

The previous prime is 72155987129. The next prime is 72155987149. The reversal of 72155987143 is 34178955127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34178955127 = 503 ⋅67950209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72155987143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72155987149) 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, 767616838 + ... + 767616931.

It is an arithmetic number, because the mean of its divisors is an integer number (18422805240).

Almost surely, 2^72155987143 is an apocalyptic number.

72155987143 is a deficient number, since it is larger than the sum of its proper divisors (1535233817).

72155987143 is a wasteful number, since it uses less digits than its factorization.

72155987143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535233816.

The product of its digits is 2116800, while the sum is 52.

The spelling of 72155987143 in words is "seventy-two billion, one hundred fifty-five million, nine hundred eighty-seven thousand, one hundred forty-three".