66470906 has 4 divisors (see below), whose sum is σ = 99706362. Its totient is φ = 33235452.

The previous prime is 66470903. The next prime is 66470917. The reversal of 66470906 is 60907466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60907466 = 2 ⋅30453733.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 292681 = 8135^2 + 541^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66470906.

It is not an unprimeable number, because it can be changed into a prime (66470903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16617725 + ... + 16617728.

Almost surely, 2^66470906 is an apocalyptic number.

66470906 is a deficient number, since it is larger than the sum of its proper divisors (33235456).

66470906 is a wasteful number, since it uses less digits than its factorization.

66470906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33235455.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66470906 is about 8152.9691524009. The cubic root of 66470906 is about 405.0828586248.

It can be divided in two parts, 66470 and 906, that added together give a palindrome (67376).

The spelling of 66470906 in words is "sixty-six million, four hundred seventy thousand, nine hundred six".