66163755 has 32 divisors (see below), whose sum is σ = 126249984. Its totient is φ = 28930176.

The previous prime is 66163753. The next prime is 66163789. The reversal of 66163755 is 55736166.

It is not a de Polignac number, because 66163755 - 2¹ = 66163753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66163751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11284 + ... + 16113.

It is an arithmetic number, because the mean of its divisors is an integer number (3945312).

Almost surely, 2^66163755 is an apocalyptic number.

66163755 is a deficient number, since it is larger than the sum of its proper divisors (60086229).

66163755 is a wasteful number, since it uses less digits than its factorization.

66163755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27435.

The product of its digits is 113400, while the sum is 39.

The square root of 66163755 is about 8134.1105844462. The cubic root of 66163755 is about 404.4579549391.

The spelling of 66163755 in words is "sixty-six million, one hundred sixty-three thousand, seven hundred fifty-five".