72018157 has 2 divisors, whose sum is σ = 72018158. Its totient is φ = 72018156.

The previous prime is 72018119. The next prime is 72018161. The reversal of 72018157 is 75181027.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57471561 + 14546596 = 7581^2 + 3814^2 .

It is a cyclic number.

It is not a de Polignac number, because 72018157 - 2⁷ = 72018029 is a prime.

It is a super-2 number, since 2×72018157² = 10373229875353298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72018197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36009078 + 36009079.

It is an arithmetic number, because the mean of its divisors is an integer number (36009079).

Almost surely, 2^72018157 is an apocalyptic number.

It is an amenable number.

72018157 is a deficient number, since it is larger than the sum of its proper divisors (1).

72018157 is an equidigital number, since it uses as much as digits as its factorization.

72018157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 72018157 is about 8486.3512182799. The cubic root of 72018157 is about 416.0517321174.

The spelling of 72018157 in words is "seventy-two million, eighteen thousand, one hundred fifty-seven".