55156666 has 16 divisors (see below), whose sum is σ = 86012640. Its totient is φ = 26495280.

The previous prime is 55156643. The next prime is 55156667. The reversal of 55156666 is 66665155.

It is not an unprimeable number, because it can be changed into a prime (55156667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9985 + ... + 14491.

It is an arithmetic number, because the mean of its divisors is an integer number (5375790).

Almost surely, 2^55156666 is an apocalyptic number.

55156666 is a deficient number, since it is larger than the sum of its proper divisors (30855974).

55156666 is a wasteful number, since it uses less digits than its factorization.

55156666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4749.

The product of its digits is 162000, while the sum is 40.

The square root of 55156666 is about 7426.7533956635. The cubic root of 55156666 is about 380.6559906479.

The spelling of 55156666 in words is "fifty-five million, one hundred fifty-six thousand, six hundred sixty-six".