55221725 has 12 divisors (see below), whose sum is σ = 73742676. Its totient is φ = 40778880.

The previous prime is 55221721. The next prime is 55221731. The reversal of 55221725 is 52712255.

It can be written as a sum of positive squares in 6 ways, for example, as 31684 + 55190041 = 178^2 + 7429^2 .

It is not a de Polignac number, because 55221725 - 2² = 55221721 is a prime.

It is a super-5 number, since 5×55221725⁵ (a number of 40 digits) contains 55555 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84632 + ... + 85281.

It is an arithmetic number, because the mean of its divisors is an integer number (6145223).

Almost surely, 2^55221725 is an apocalyptic number.

It is an amenable number.

55221725 is a deficient number, since it is larger than the sum of its proper divisors (18520951).

55221725 is a wasteful number, since it uses less digits than its factorization.

55221725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169936 (or 169931 counting only the distinct ones).

The product of its digits is 7000, while the sum is 29.

The square root of 55221725 is about 7431.1321479301. The cubic root of 55221725 is about 380.8055970279.

The spelling of 55221725 in words is "fifty-five million, two hundred twenty-one thousand, seven hundred twenty-five".