79666511 has 4 divisors (see below), whose sum is σ = 79732152. Its totient is φ = 79600872.

The previous prime is 79666501. The next prime is 79666553. The reversal of 79666511 is 11566697.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11566697 = 613 ⋅18869.

It is a cyclic number.

It is not a de Polignac number, because 79666511 - 2²² = 75472207 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 (79666501) 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, 30965 + ... + 33438.

It is an arithmetic number, because the mean of its divisors is an integer number (19933038).

Almost surely, 2^79666511 is an apocalyptic number.

79666511 is a deficient number, since it is larger than the sum of its proper divisors (65641).

79666511 is a wasteful number, since it uses less digits than its factorization.

79666511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65640.

The product of its digits is 68040, while the sum is 41.

The square root of 79666511 is about 8925.6098391090. The cubic root of 79666511 is about 430.2873705529.

The spelling of 79666511 in words is "seventy-nine million, six hundred sixty-six thousand, five hundred eleven".