66620045 has 8 divisors (see below), whose sum is σ = 80046360. Its totient is φ = 53227840.

The previous prime is 66620003. The next prime is 66620053. The reversal of 66620045 is 54002666.

It can be written as a sum of positive squares in 4 ways, for example, as 16337764 + 50282281 = 4042^2 + 7091^2 .

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

It is not a de Polignac number, because 66620045 - 2⁶ = 66619981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4010 + ... + 12219.

It is an arithmetic number, because the mean of its divisors is an integer number (10005795).

Almost surely, 2^66620045 is an apocalyptic number.

It is an amenable number.

66620045 is a deficient number, since it is larger than the sum of its proper divisors (13426315).

66620045 is a wasteful number, since it uses less digits than its factorization.

66620045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17055.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66620045 is about 8162.1103276052. The cubic root of 66620045 is about 405.3855901981.

The spelling of 66620045 in words is "sixty-six million, six hundred twenty thousand, forty-five".