66645477 has 8 divisors (see below), whose sum is σ = 98734080. Its totient is φ = 44430300.

The previous prime is 66645461. The next prime is 66645493. The reversal of 66645477 is 77454666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66645461) and next prime (66645493).

It is not a de Polignac number, because 66645477 - 2⁴ = 66645461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66645437) 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, 1234149 + ... + 1234202.

It is an arithmetic number, because the mean of its divisors is an integer number (12341760).

Almost surely, 2^66645477 is an apocalyptic number.

It is an amenable number.

66645477 is a deficient number, since it is larger than the sum of its proper divisors (32088603).

66645477 is a wasteful number, since it uses less digits than its factorization.

66645477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468360 (or 2468354 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 66645477 is about 8163.6681093734. The cubic root of 66645477 is about 405.4371685416.

The spelling of 66645477 in words is "sixty-six million, six hundred forty-five thousand, four hundred seventy-seven".