66357755 has 4 divisors (see below), whose sum is σ = 79629312. Its totient is φ = 53086200.

The previous prime is 66357703. The next prime is 66357769. The reversal of 66357755 is 55775366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55775366 = 2 ⋅27887683.

It is a de Polignac number, because none of the positive numbers 2^k-66357755 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6635771 + ... + 6635780.

It is an arithmetic number, because the mean of its divisors is an integer number (19907328).

Almost surely, 2^66357755 is an apocalyptic number.

66357755 is a deficient number, since it is larger than the sum of its proper divisors (13271557).

66357755 is a wasteful number, since it uses less digits than its factorization.

66357755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13271556.

The product of its digits is 661500, while the sum is 44.

The square root of 66357755 is about 8146.0269456957. The cubic root of 66357755 is about 404.8528754839.

The spelling of 66357755 in words is "sixty-six million, three hundred fifty-seven thousand, seven hundred fifty-five".