55221643766 has 8 divisors (see below), whose sum is σ = 82833487704. Its totient is φ = 27610481200.

The previous prime is 55221643699. The next prime is 55221643793. The reversal of 55221643766 is 66734612255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 55221643766.

It is a congruent 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, 161786 + ... + 369618.

It is an arithmetic number, because the mean of its divisors is an integer number (10354185963).

Almost surely, 2^55221643766 is an apocalyptic number.

55221643766 is a deficient number, since it is larger than the sum of its proper divisors (27611843938).

55221643766 is a wasteful number, since it uses less digits than its factorization.

55221643766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340686.

The product of its digits is 1814400, while the sum is 47.

The spelling of 55221643766 in words is "fifty-five billion, two hundred twenty-one million, six hundred forty-three thousand, seven hundred sixty-six".