55221232551 has 8 divisors (see below), whose sum is σ = 74122460400. Its totient is φ = 36567079872.

The previous prime is 55221232537. The next prime is 55221232553. The reversal of 55221232551 is 15523212255.

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

It is not a de Polignac number, because 55221232551 - 2²⁹ = 54684361639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221232553) 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, 61768270 + ... + 61769163.

It is an arithmetic number, because the mean of its divisors is an integer number (9265307550).

Almost surely, 2^55221232551 is an apocalyptic number.

55221232551 is a deficient number, since it is larger than the sum of its proper divisors (18901227849).

55221232551 is a wasteful number, since it uses less digits than its factorization.

55221232551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123537585.

The product of its digits is 30000, while the sum is 33.

The spelling of 55221232551 in words is "fifty-five billion, two hundred twenty-one million, two hundred thirty-two thousand, five hundred fifty-one".