79889767621 has 8 divisors (see below), whose sum is σ = 79978910400. Its totient is φ = 79800676032.

The previous prime is 79889767591. The next prime is 79889767673. The reversal of 79889767621 is 12676798897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79889767621 - 2¹³ = 79889759429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79889767021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3679405 + ... + 3701053.

It is an arithmetic number, because the mean of its divisors is an integer number (9997363800).

Almost surely, 2^79889767621 is an apocalyptic number.

It is an amenable number.

79889767621 is a deficient number, since it is larger than the sum of its proper divisors (89142779).

79889767621 is a wasteful number, since it uses less digits than its factorization.

79889767621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25595.

The product of its digits is 128024064, while the sum is 70.

The spelling of 79889767621 in words is "seventy-nine billion, eight hundred eighty-nine million, seven hundred sixty-seven thousand, six hundred twenty-one".