66477375 has 32 divisors (see below), whose sum is σ = 122915520. Its totient is φ = 35452800.

The previous prime is 66477349. The next prime is 66477401. The reversal of 66477375 is 57377466.

It is an interprime number because it is at equal distance from previous prime (66477349) and next prime (66477401).

It is not a de Polignac number, because 66477375 - 2⁶ = 66477311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66477375.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6474 + ... + 13223.

It is an arithmetic number, because the mean of its divisors is an integer number (3841110).

Almost surely, 2^66477375 is an apocalyptic number.

66477375 is a deficient number, since it is larger than the sum of its proper divisors (56438145).

66477375 is a wasteful number, since it uses less digits than its factorization.

66477375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19721 (or 19705 counting only the distinct ones).

The product of its digits is 740880, while the sum is 45.

The square root of 66477375 is about 8153.3658693818. The cubic root of 66477375 is about 405.0959991909.

Subtracting from 66477375 its reverse (57377466), we obtain a palindrome (9099909).

The spelling of 66477375 in words is "sixty-six million, four hundred seventy-seven thousand, three hundred seventy-five".