66420045 has 12 divisors (see below), whose sum is σ = 115128156. Its totient is φ = 35424000.

The previous prime is 66420043. The next prime is 66420061. The reversal of 66420045 is 54002466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 37711881 + 28708164 = 6141^2 + 5358^2 .

It is not a de Polignac number, because 66420045 - 2¹ = 66420043 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66420043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 737956 + ... + 738045.

It is an arithmetic number, because the mean of its divisors is an integer number (9594013).

Almost surely, 2^66420045 is an apocalyptic number.

It is an amenable number.

66420045 is a deficient number, since it is larger than the sum of its proper divisors (48708111).

66420045 is a wasteful number, since it uses less digits than its factorization.

66420045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476012 (or 1476009 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 66420045 is about 8149.8493851114. The cubic root of 66420045 is about 404.9795142816.

The spelling of 66420045 in words is "sixty-six million, four hundred twenty thousand, forty-five".