55621774451 has 4 divisors (see below), whose sum is σ = 55631039952. Its totient is φ = 55612508952.

The previous prime is 55621774393. The next prime is 55621774457. The reversal of 55621774451 is 15447712655.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55621774451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55621774396 and 55621774405.

It is not an unprimeable number, because it can be changed into a prime (55621774457) 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, 4623740 + ... + 4635753.

It is an arithmetic number, because the mean of its divisors is an integer number (13907759988).

Almost surely, 2^55621774451 is an apocalyptic number.

55621774451 is a deficient number, since it is larger than the sum of its proper divisors (9265501).

55621774451 is an equidigital number, since it uses as much as digits as its factorization.

55621774451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9265500.

The product of its digits is 1176000, while the sum is 47.

The spelling of 55621774451 in words is "fifty-five billion, six hundred twenty-one million, seven hundred seventy-four thousand, four hundred fifty-one".