605505551 has 4 divisors (see below), whose sum is σ = 692006352. Its totient is φ = 519004752.

The previous prime is 605505517. The next prime is 605505553. The reversal of 605505551 is 155505506.

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

It is not a de Polignac number, because 605505551 - 2¹⁸ = 605243407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605505553) 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, 43250390 + ... + 43250403.

It is an arithmetic number, because the mean of its divisors is an integer number (173001588).

Almost surely, 2^605505551 is an apocalyptic number.

605505551 is a deficient number, since it is larger than the sum of its proper divisors (86500801).

605505551 is an equidigital number, since it uses as much as digits as its factorization.

605505551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86500800.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 605505551 is about 24607.0223919921. The cubic root of 605505551 is about 846.0045711553.

The spelling of 605505551 in words is "six hundred five million, five hundred five thousand, five hundred fifty-one".