81676302973 has 4 divisors (see below), whose sum is σ = 81795888288. Its totient is φ = 81556717660.

The previous prime is 81676302949. The next prime is 81676302977. The reversal of 81676302973 is 37920367618.

It is a happy number.

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 81676302973 - 2¹³ = 81676294781 is a prime.

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 81676302973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81676302977) 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, 59791633 + ... + 59792998.

It is an arithmetic number, because the mean of its divisors is an integer number (20448972072).

Almost surely, 2^81676302973 is an apocalyptic number.

It is an amenable number.

81676302973 is a deficient number, since it is larger than the sum of its proper divisors (119585315).

81676302973 is a wasteful number, since it uses less digits than its factorization.

81676302973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119585314.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 81676302973 in words is "eighty-one billion, six hundred seventy-six million, three hundred two thousand, nine hundred seventy-three".