66018955 has 4 divisors (see below), whose sum is σ = 79222752. Its totient is φ = 52815160.

The previous prime is 66018949. The next prime is 66018991. The reversal of 66018955 is 55981066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55981066 = 2 ⋅27990533.

It is not a de Polignac number, because 66018955 - 2⁵ = 66018923 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6601891 + ... + 6601900.

It is an arithmetic number, because the mean of its divisors is an integer number (19805688).

Almost surely, 2^66018955 is an apocalyptic number.

66018955 is a deficient number, since it is larger than the sum of its proper divisors (13203797).

66018955 is a wasteful number, since it uses less digits than its factorization.

66018955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13203796.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 66018955 is about 8125.2049204928. The cubic root of 66018955 is about 404.1626860887.

The spelling of 66018955 in words is "sixty-six million, eighteen thousand, nine hundred fifty-five".