66620723 has 8 divisors (see below), whose sum is σ = 72922416. Its totient is φ = 60487200.

The previous prime is 66620693. The next prime is 66620753. The reversal of 66620723 is 32702666.

It is an interprime number because it is at equal distance from previous prime (66620693) and next prime (66620753).

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 66620723 - 2¹⁴ = 66604339 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 66620723.

It is not an unprimeable number, because it can be changed into a prime (66620753) 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, 41213 + ... + 42798.

It is an arithmetic number, because the mean of its divisors is an integer number (9115302).

Almost surely, 2^66620723 is an apocalyptic number.

66620723 is a deficient number, since it is larger than the sum of its proper divisors (6301693).

66620723 is a wasteful number, since it uses less digits than its factorization.

66620723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84085.

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

The square root of 66620723 is about 8162.1518608759. The cubic root of 66620723 is about 405.3869654123.

The spelling of 66620723 in words is "sixty-six million, six hundred twenty thousand, seven hundred twenty-three".