81196235501 has 16 divisors (see below), whose sum is σ = 86046105600. Its totient is φ = 76404701808.

The previous prime is 81196235489. The next prime is 81196235563. The reversal of 81196235501 is 10553269118.

It is a cyclic number.

It is not a de Polignac number, because 81196235501 - 2³⁰ = 80122493677 is a prime.

It is a super-3 number, since 3×81196235501³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81196235581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4557056 + ... + 4574838.

It is an arithmetic number, because the mean of its divisors is an integer number (5377881600).

Almost surely, 2^81196235501 is an apocalyptic number.

It is an amenable number.

81196235501 is a deficient number, since it is larger than the sum of its proper divisors (4849870099).

81196235501 is a wasteful number, since it uses less digits than its factorization.

81196235501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19408.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 81196235501 in words is "eighty-one billion, one hundred ninety-six million, two hundred thirty-five thousand, five hundred one".