81672826601 has 16 divisors (see below), whose sum is σ = 85354048080. Its totient is φ = 78087905280.

The previous prime is 81672826577. The next prime is 81672826607. The reversal of 81672826601 is 10662827618.

It can be written as a sum of positive squares in 8 ways, for example, as 27895680400 + 53777146201 = 167020^2 + 231899^2 .

It is a cyclic number.

It is not a de Polignac number, because 81672826601 - 2¹⁴ = 81672810217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81672826607) 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, 313301 + ... + 511373.

It is an arithmetic number, because the mean of its divisors is an integer number (5334628005).

Almost surely, 2^81672826601 is an apocalyptic number.

It is an amenable number.

81672826601 is a deficient number, since it is larger than the sum of its proper divisors (3681221479).

81672826601 is a wasteful number, since it uses less digits than its factorization.

81672826601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198316.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 81672826601 in words is "eighty-one billion, six hundred seventy-two million, eight hundred twenty-six thousand, six hundred one".