81735475501 has 4 divisors (see below), whose sum is σ = 81737171932. Its totient is φ = 81733779072.

The previous prime is 81735475483. The next prime is 81735475513. The reversal of 81735475501 is 10557453718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43211599876 + 38523875625 = 207874^2 + 196275^2 .

It is a cyclic number.

It is not a de Polignac number, because 81735475501 - 2⁵ = 81735475469 is a prime.

It is a super-3 number, since 3×81735475501³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81735475571) 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, 773766 + ... + 873031.

It is an arithmetic number, because the mean of its divisors is an integer number (20434292983).

Almost surely, 2^81735475501 is an apocalyptic number.

It is an amenable number.

81735475501 is a deficient number, since it is larger than the sum of its proper divisors (1696431).

81735475501 is a wasteful number, since it uses less digits than its factorization.

81735475501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696430.

The product of its (nonzero) digits is 588000, while the sum is 46.

The spelling of 81735475501 in words is "eighty-one billion, seven hundred thirty-five million, four hundred seventy-five thousand, five hundred one".