81264601312313 has 4 divisors (see below), whose sum is σ = 81285086469120. Its totient is φ = 81244116155508.

The previous prime is 81264601312309. The next prime is 81264601312339. The reversal of 81264601312313 is 31321310646218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81264601312313 - 2² = 81264601312309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81264601312393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10242572453 + ... + 10242580386.

It is an arithmetic number, because the mean of its divisors is an integer number (20321271617280).

Almost surely, 2^{81264601312313} is an apocalyptic number.

It is an amenable number.

81264601312313 is a deficient number, since it is larger than the sum of its proper divisors (20485156807).

81264601312313 is a wasteful number, since it uses less digits than its factorization.

81264601312313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20485156806.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 81264601312313 in words is "eighty-one trillion, two hundred sixty-four billion, six hundred one million, three hundred twelve thousand, three hundred thirteen".