55501555 has 4 divisors (see below), whose sum is σ = 66601872. Its totient is φ = 44401240.

The previous prime is 55501531. The next prime is 55501559. The reversal of 55501555 is 55510555.

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

It is not a de Polignac number, because 55501555 - 2⁷ = 55501427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55501559) 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, 5550151 + ... + 5550160.

It is an arithmetic number, because the mean of its divisors is an integer number (16650468).

Almost surely, 2^55501555 is an apocalyptic number.

55501555 is a deficient number, since it is larger than the sum of its proper divisors (11100317).

55501555 is a wasteful number, since it uses less digits than its factorization.

55501555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11100316.

The product of its (nonzero) digits is 15625, while the sum is 31.

The square root of 55501555 is about 7449.9365769112. The cubic root of 55501555 is about 381.4477436960.

The spelling of 55501555 in words is "fifty-five million, five hundred one thousand, five hundred fifty-five".