72891473591 has 2 divisors, whose sum is σ = 72891473592. Its totient is φ = 72891473590.

The previous prime is 72891473537. The next prime is 72891473609. The reversal of 72891473591 is 19537419827.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72891473591 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72891433591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36445736795 + 36445736796.

It is an arithmetic number, because the mean of its divisors is an integer number (36445736796).

Almost surely, 2^72891473591 is an apocalyptic number.

72891473591 is a deficient number, since it is larger than the sum of its proper divisors (1).

72891473591 is an equidigital number, since it uses as much as digits as its factorization.

72891473591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The spelling of 72891473591 in words is "seventy-two billion, eight hundred ninety-one million, four hundred seventy-three thousand, five hundred ninety-one".