66001155 has 64 divisors (see below), whose sum is σ = 124761600. Its totient is φ = 29445120.

The previous prime is 66001151. The next prime is 66001163. The reversal of 66001155 is 55110066.

It is not a de Polignac number, because 66001155 - 2² = 66001151 is a prime.

It is a super-2 number, since 2×66001155² = 8712304922668050, which contains 22 as substring.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66001151) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 115711 + ... + 116279.

It is an arithmetic number, because the mean of its divisors is an integer number (1949400).

Almost surely, 2^66001155 is an apocalyptic number.

66001155 is a deficient number, since it is larger than the sum of its proper divisors (58760445).

66001155 is a wasteful number, since it uses less digits than its factorization.

66001155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 66001155 is about 8124.1094896610. The cubic root of 66001155 is about 404.1263594385.

It can be divided in two parts, 660011 and 55, that added together give a palindrome (660066).

The spelling of 66001155 in words is "sixty-six million, one thousand, one hundred fifty-five".