66470631 has 4 divisors (see below), whose sum is σ = 88627512. Its totient is φ = 44313752.

The previous prime is 66470617. The next prime is 66470659. The reversal of 66470631 is 13607466.

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 66470631 - 2⁶ = 66470567 is a prime.

It is a super-2 number, since 2×66470631² = 8836689571076322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66470592 and 66470601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66470671) 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, 11078436 + ... + 11078441.

It is an arithmetic number, because the mean of its divisors is an integer number (22156878).

Almost surely, 2^66470631 is an apocalyptic number.

66470631 is a deficient number, since it is larger than the sum of its proper divisors (22156881).

66470631 is a wasteful number, since it uses less digits than its factorization.

66470631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22156880.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 66470631 is about 8152.9522873619. The cubic root of 66470631 is about 405.0822999947.

The spelling of 66470631 in words is "sixty-six million, four hundred seventy thousand, six hundred thirty-one".