66022211555 has 4 divisors (see below), whose sum is σ = 79226653872. Its totient is φ = 52817769240.

The previous prime is 66022211543. The next prime is 66022211573. The reversal of 66022211555 is 55511222066.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-66022211555 is a prime.

It is a super-2 number, since 2×66022211555² (a number of 22 digits) contains 22 as substring.

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, 6602221151 + ... + 6602221160.

It is an arithmetic number, because the mean of its divisors is an integer number (19806663468).

Almost surely, 2^66022211555 is an apocalyptic number.

66022211555 is a deficient number, since it is larger than the sum of its proper divisors (13204442317).

66022211555 is a wasteful number, since it uses less digits than its factorization.

66022211555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13204442316.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 66022211555 in words is "sixty-six billion, twenty-two million, two hundred eleven thousand, five hundred fifty-five".