66000000055 has 16 divisors (see below), whose sum is σ = 86495324544. Its totient is φ = 47947042080.

The previous prime is 66000000049. The next prime is 66000000067. The reversal of 66000000055 is 55000000066.

It is not a de Polignac number, because 66000000055 - 2⁷ = 65999999927 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 65999999972 and 66000000035.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 611637 + ... + 711406.

It is an arithmetic number, because the mean of its divisors is an integer number (5405957784).

Almost surely, 2^66000000055 is an apocalyptic number.

66000000055 is a deficient number, since it is larger than the sum of its proper divisors (20495324489).

66000000055 is a wasteful number, since it uses less digits than its factorization.

66000000055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323966.

The product of its (nonzero) digits is 900, while the sum is 22.

Adding to 66000000055 its reverse (55000000066), we get a palindrome (121000000121).

The spelling of 66000000055 in words is "sixty-six billion, fifty-five", and thus it is an aban number and an uban number.