81184356201 has 16 divisors (see below), whose sum is σ = 116641359296. Its totient is φ = 49930053696.

The previous prime is 81184356181. The next prime is 81184356217. The reversal of 81184356201 is 10265348118.

It is not a de Polignac number, because 81184356201 - 2²⁷ = 81050138473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81184356201.

It is not an unprimeable number, because it can be changed into a prime (81184355201) 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, 548755 + ... + 680808.

It is an arithmetic number, because the mean of its divisors is an integer number (7290084956).

Almost surely, 2^81184356201 is an apocalyptic number.

It is an amenable number.

81184356201 is a deficient number, since it is larger than the sum of its proper divisors (35457003095).

81184356201 is a wasteful number, since it uses less digits than its factorization.

81184356201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231272.

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 81184356201 in words is "eighty-one billion, one hundred eighty-four million, three hundred fifty-six thousand, two hundred one".