72278755231 has 2 divisors, whose sum is σ = 72278755232. Its totient is φ = 72278755230.

The previous prime is 72278755217. The next prime is 72278755253. The reversal of 72278755231 is 13255787227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72278755231 - 2²⁷ = 72144537503 is a prime.

It is a super-2 number, since 2×72278755231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72278755261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36139377615 + 36139377616.

It is an arithmetic number, because the mean of its divisors is an integer number (36139377616).

Almost surely, 2^72278755231 is an apocalyptic number.

72278755231 is a deficient number, since it is larger than the sum of its proper divisors (1).

72278755231 is an equidigital number, since it uses as much as digits as its factorization.

72278755231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1646400, while the sum is 49.

The spelling of 72278755231 in words is "seventy-two billion, two hundred seventy-eight million, seven hundred fifty-five thousand, two hundred thirty-one".