81260661063 has 32 divisors (see below), whose sum is σ = 112628565504. Its totient is φ = 52073280000.

The previous prime is 81260661061. The next prime is 81260661103. The reversal of 81260661063 is 36016606218.

It is not a de Polignac number, because 81260661063 - 2¹ = 81260661061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81260661061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22014048 + ... + 22017738.

It is an arithmetic number, because the mean of its divisors is an integer number (3519642672).

Almost surely, 2^81260661063 is an apocalyptic number.

81260661063 is a deficient number, since it is larger than the sum of its proper divisors (31367904441).

81260661063 is a wasteful number, since it uses less digits than its factorization.

81260661063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6327.

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 81260661063 in words is "eighty-one billion, two hundred sixty million, six hundred sixty-one thousand, sixty-three".