81520200367 has 2 divisors, whose sum is σ = 81520200368. Its totient is φ = 81520200366.

The previous prime is 81520200337. The next prime is 81520200481. The reversal of 81520200367 is 76300202518.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81520200367 - 2⁷ = 81520200239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81520200337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40760100183 + 40760100184.

It is an arithmetic number, because the mean of its divisors is an integer number (40760100184).

Almost surely, 2^81520200367 is an apocalyptic number.

81520200367 is a deficient number, since it is larger than the sum of its proper divisors (1).

81520200367 is an equidigital number, since it uses as much as digits as its factorization.

81520200367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 81520200367 in words is "eighty-one billion, five hundred twenty million, two hundred thousand, three hundred sixty-seven".