78946272491 has 2 divisors, whose sum is σ = 78946272492. Its totient is φ = 78946272490.

The previous prime is 78946272437. The next prime is 78946272553. The reversal of 78946272491 is 19427264987.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78946272491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78946272491.

It is not a weakly prime, because it can be changed into another prime (78946277491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39473136245 + 39473136246.

It is an arithmetic number, because the mean of its divisors is an integer number (39473136246).

Almost surely, 2^78946272491 is an apocalyptic number.

78946272491 is a deficient number, since it is larger than the sum of its proper divisors (1).

78946272491 is an equidigital number, since it uses as much as digits as its factorization.

78946272491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12192768, while the sum is 59.

The spelling of 78946272491 in words is "seventy-eight billion, nine hundred forty-six million, two hundred seventy-two thousand, four hundred ninety-one".