81200466197 has 4 divisors (see below), whose sum is σ = 81820317216. Its totient is φ = 80580615180.

The previous prime is 81200466181. The next prime is 81200466203. The reversal of 81200466197 is 79166400218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81200466197 - 2⁴ = 81200466181 is a prime.

It is a super-2 number, since 2×81200466197² (a number of 23 digits) contains 22 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 (81200466157) 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, 309925313 + ... + 309925574.

It is an arithmetic number, because the mean of its divisors is an integer number (20455079304).

Almost surely, 2^81200466197 is an apocalyptic number.

It is an amenable number.

81200466197 is a deficient number, since it is larger than the sum of its proper divisors (619851019).

81200466197 is a wasteful number, since it uses less digits than its factorization.

81200466197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619851018.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 81200466197 in words is "eighty-one billion, two hundred million, four hundred sixty-six thousand, one hundred ninety-seven".