66702623 has 16 divisors (see below), whose sum is σ = 73543680. Its totient is φ = 60124896.

The previous prime is 66702619. The next prime is 66702631. The reversal of 66702623 is 32620766.

It is not a de Polignac number, because 66702623 - 2² = 66702619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66702623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66702653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109586 + ... + 110192.

It is an arithmetic number, because the mean of its divisors is an integer number (4596480).

Almost surely, 2^66702623 is an apocalyptic number.

66702623 is a deficient number, since it is larger than the sum of its proper divisors (6841057).

66702623 is a wasteful number, since it uses less digits than its factorization.

66702623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 66702623 is about 8167.1673792080. The cubic root of 66702623 is about 405.5530178306.

The spelling of 66702623 in words is "sixty-six million, seven hundred two thousand, six hundred twenty-three".