55221646567 has 4 divisors (see below), whose sum is σ = 58469978736. Its totient is φ = 51973314400.

The previous prime is 55221646559. The next prime is 55221646591. The reversal of 55221646567 is 76564612255.

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

It is a cyclic number.

It is not a de Polignac number, because 55221646567 - 2³ = 55221646559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55221646567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221641567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624166059 + ... + 1624166092.

It is an arithmetic number, because the mean of its divisors is an integer number (14617494684).

Almost surely, 2^55221646567 is an apocalyptic number.

55221646567 is a deficient number, since it is larger than the sum of its proper divisors (3248332169).

55221646567 is a wasteful number, since it uses less digits than its factorization.

55221646567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3248332168.

The product of its digits is 3024000, while the sum is 49.

The spelling of 55221646567 in words is "fifty-five billion, two hundred twenty-one million, six hundred forty-six thousand, five hundred sixty-seven".