72178051481 has 4 divisors (see below), whose sum is σ = 73713754752. Its totient is φ = 70642348212.

The previous prime is 72178051417. The next prime is 72178051511. The reversal of 72178051481 is 18415087127.

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: 18415087127 = 79841 ⋅230647.

It is a cyclic number.

It is not a de Polignac number, because 72178051481 - 2⁶ = 72178051417 is a prime.

It is a super-2 number, since 2×72178051481² (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 (72178051411) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 767851565 + ... + 767851658.

It is an arithmetic number, because the mean of its divisors is an integer number (18428438688).

Almost surely, 2^72178051481 is an apocalyptic number.

It is an amenable number.

72178051481 is a deficient number, since it is larger than the sum of its proper divisors (1535703271).

72178051481 is a wasteful number, since it uses less digits than its factorization.

72178051481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535703270.

The product of its (nonzero) digits is 125440, while the sum is 44.

The spelling of 72178051481 in words is "seventy-two billion, one hundred seventy-eight million, fifty-one thousand, four hundred eighty-one".