66402623 has 8 divisors (see below), whose sum is σ = 75954720. Its totient is φ = 56867040.

The previous prime is 66402607. The next prime is 66402643. The reversal of 66402623 is 32620466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66402623 - 2⁴ = 66402607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66402643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6233 + ... + 13101.

It is an arithmetic number, because the mean of its divisors is an integer number (9494340).

Almost surely, 2^66402623 is an apocalyptic number.

66402623 is a deficient number, since it is larger than the sum of its proper divisors (9552097).

66402623 is a wasteful number, since it uses less digits than its factorization.

66402623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8257.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 66402623 is about 8148.7804609033. The cubic root of 66402623 is about 404.9441024313.

The spelling of 66402623 in words is "sixty-six million, four hundred two thousand, six hundred twenty-three".