81695202281 has 24 divisors (see below), whose sum is σ = 103004358912. Its totient is φ = 63423518400.

The previous prime is 81695202263. The next prime is 81695202287. The reversal of 81695202281 is 18220259618.

It is not a de Polignac number, because 81695202281 - 2³⁰ = 80621460457 is a prime.

It is a super-2 number, since 2×81695202281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81695202287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51581 + ... + 407493.

It is an arithmetic number, because the mean of its divisors is an integer number (4291848288).

Almost surely, 2^81695202281 is an apocalyptic number.

It is an amenable number.

81695202281 is a deficient number, since it is larger than the sum of its proper divisors (21309156631).

81695202281 is a wasteful number, since it uses less digits than its factorization.

81695202281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356213 (or 356202 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 81695202281 in words is "eighty-one billion, six hundred ninety-five million, two hundred two thousand, two hundred eighty-one".