81264378035077 has 2 divisors, whose sum is σ = 81264378035078. Its totient is φ = 81264378035076.

The previous prime is 81264378034999. The next prime is 81264378035107. The reversal of 81264378035077 is 77053087346218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79389543426561 + 1874834608516 = 8910081^2 + 1369246^2 .

It is a cyclic number.

It is not a de Polignac number, because 81264378035077 - 2¹⁵ = 81264378002309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81264378035677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40632189017538 + 40632189017539.

It is an arithmetic number, because the mean of its divisors is an integer number (40632189017539).

Almost surely, 2^{81264378035077} is an apocalyptic number.

It is an amenable number.

81264378035077 is a deficient number, since it is larger than the sum of its proper divisors (1).

81264378035077 is an equidigital number, since it uses as much as digits as its factorization.

81264378035077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 81264378035077 in words is "eighty-one trillion, two hundred sixty-four billion, three hundred seventy-eight million, thirty-five thousand, seventy-seven".