66112555 has 4 divisors (see below), whose sum is σ = 79335072. Its totient is φ = 52890040.

The previous prime is 66112537. The next prime is 66112561. The reversal of 66112555 is 55521166.

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-66112555 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, 6611251 + ... + 6611260.

It is an arithmetic number, because the mean of its divisors is an integer number (19833768).

Almost surely, 2^66112555 is an apocalyptic number.

66112555 is a deficient number, since it is larger than the sum of its proper divisors (13222517).

66112555 is a wasteful number, since it uses less digits than its factorization.

66112555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13222516.

The product of its digits is 9000, while the sum is 31.

The square root of 66112555 is about 8130.9627351255. The cubic root of 66112555 is about 404.3535997616.

It can be divided in two parts, 6 and 6112555, that multiplied together give a triangular number (36675330 = T₈₅₆₄).

The spelling of 66112555 in words is "sixty-six million, one hundred twelve thousand, five hundred fifty-five".