66610051 has 4 divisors (see below), whose sum is σ = 67089400. Its totient is φ = 66130704.

The previous prime is 66610043. The next prime is 66610069. The reversal of 66610051 is 15001666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15001666 = 2 ⋅7500833.

It is a cyclic number.

It is not a de Polignac number, because 66610051 - 2³ = 66610043 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66609998 and 66610025.

It is not an unprimeable number, because it can be changed into a prime (66610021) 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, 239466 + ... + 239743.

It is an arithmetic number, because the mean of its divisors is an integer number (16772350).

Almost surely, 2^66610051 is an apocalyptic number.

66610051 is a deficient number, since it is larger than the sum of its proper divisors (479349).

66610051 is a wasteful number, since it uses less digits than its factorization.

66610051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479348.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 66610051 is about 8161.4980855233. The cubic root of 66610051 is about 405.3653178901.

It can be divided in two parts, 666 and 10051, that multiplied together give a palindrome (6693966).

The spelling of 66610051 in words is "sixty-six million, six hundred ten thousand, fifty-one".