72144156197 has 4 divisors (see below), whose sum is σ = 72255662496. Its totient is φ = 72032649900.

The previous prime is 72144156191. The next prime is 72144156221. The reversal of 72144156197 is 79165144127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79165144127 = 19 ⋅4166586533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72144156197 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 (72144156191) 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, 55752179 + ... + 55753472.

It is an arithmetic number, because the mean of its divisors is an integer number (18063915624).

Almost surely, 2^72144156197 is an apocalyptic number.

It is an amenable number.

72144156197 is a deficient number, since it is larger than the sum of its proper divisors (111506299).

72144156197 is a wasteful number, since it uses less digits than its factorization.

72144156197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111506298.

The product of its digits is 423360, while the sum is 47.

The spelling of 72144156197 in words is "seventy-two billion, one hundred forty-four million, one hundred fifty-six thousand, one hundred ninety-seven".