72478440361 has 2 divisors, whose sum is σ = 72478440362. Its totient is φ = 72478440360.

The previous prime is 72478440337. The next prime is 72478440371. The reversal of 72478440361 is 16304487427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37164513961 + 35313926400 = 192781^2 + 187920^2 .

It is an emirp because it is prime and its reverse (16304487427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72478440361 is a prime.

It is not a weakly prime, because it can be changed into another prime (72478440371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36239220180 + 36239220181.

It is an arithmetic number, because the mean of its divisors is an integer number (36239220181).

Almost surely, 2^72478440361 is an apocalyptic number.

It is an amenable number.

72478440361 is a deficient number, since it is larger than the sum of its proper divisors (1).

72478440361 is an equidigital number, since it uses as much as digits as its factorization.

72478440361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 46.

The spelling of 72478440361 in words is "seventy-two billion, four hundred seventy-eight million, four hundred forty thousand, three hundred sixty-one".