81964725151 has 2 divisors, whose sum is σ = 81964725152. Its totient is φ = 81964725150.

The previous prime is 81964725149. The next prime is 81964725239. The reversal of 81964725151 is 15152746918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81964725151 - 2¹ = 81964725149 is a prime.

Together with 81964725149, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 81964725095 and 81964725104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81964725251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40982362575 + 40982362576.

It is an arithmetic number, because the mean of its divisors is an integer number (40982362576).

Almost surely, 2^81964725151 is an apocalyptic number.

81964725151 is a deficient number, since it is larger than the sum of its proper divisors (1).

81964725151 is an equidigital number, since it uses as much as digits as its factorization.

81964725151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 49.

The spelling of 81964725151 in words is "eighty-one billion, nine hundred sixty-four million, seven hundred twenty-five thousand, one hundred fifty-one".