72278192641 has 2 divisors, whose sum is σ = 72278192642. Its totient is φ = 72278192640.

The previous prime is 72278192603. The next prime is 72278192653. The reversal of 72278192641 is 14629187227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46132596225 + 26145596416 = 214785^2 + 161696^2 .

It is a cyclic number.

It is not a de Polignac number, because 72278192641 - 2¹⁵ = 72278159873 is a prime.

It is not a weakly prime, because it can be changed into another prime (72278192671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36139096320 + 36139096321.

It is an arithmetic number, because the mean of its divisors is an integer number (36139096321).

Almost surely, 2^72278192641 is an apocalyptic number.

It is an amenable number.

72278192641 is a deficient number, since it is larger than the sum of its proper divisors (1).

72278192641 is an equidigital number, since it uses as much as digits as its factorization.

72278192641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The spelling of 72278192641 in words is "seventy-two billion, two hundred seventy-eight million, one hundred ninety-two thousand, six hundred forty-one".