72278081803 has 2 divisors, whose sum is σ = 72278081804. Its totient is φ = 72278081802.

The previous prime is 72278081779. The next prime is 72278081809. The reversal of 72278081803 is 30818087227.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72278081803 is a prime.

It is a super-2 number, since 2×72278081803² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72278081809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36139040901 + 36139040902.

It is an arithmetic number, because the mean of its divisors is an integer number (36139040902).

Almost surely, 2^72278081803 is an apocalyptic number.

72278081803 is a deficient number, since it is larger than the sum of its proper divisors (1).

72278081803 is an equidigital number, since it uses as much as digits as its factorization.

72278081803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 72278081803 in words is "seventy-two billion, two hundred seventy-eight million, eighty-one thousand, eight hundred three".