66798051 has 4 divisors (see below), whose sum is σ = 89064072. Its totient is φ = 44532032.

The previous prime is 66798031. The next prime is 66798059. The reversal of 66798051 is 15089766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66798051 - 2¹¹ = 66796003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66797994 and 66798012.

It is not an unprimeable number, because it can be changed into a prime (66798059) 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, 11133006 + ... + 11133011.

It is an arithmetic number, because the mean of its divisors is an integer number (22266018).

Almost surely, 2^66798051 is an apocalyptic number.

66798051 is a deficient number, since it is larger than the sum of its proper divisors (22266021).

66798051 is a wasteful number, since it uses less digits than its factorization.

66798051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22266020.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 66798051 is about 8173.0074635962. The cubic root of 66798051 is about 405.7463269310.

The spelling of 66798051 in words is "sixty-six million, seven hundred ninety-eight thousand, fifty-one".