645530055 has 16 divisors (see below), whose sum is σ = 1033181664. Its totient is φ = 344171520.

The previous prime is 645530023. The next prime is 645530057. The reversal of 645530055 is 550035546.

It is not a de Polignac number, because 645530055 - 2⁵ = 645530023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645529998 and 645530025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645530057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65235 + ... + 74475.

It is an arithmetic number, because the mean of its divisors is an integer number (64573854).

Almost surely, 2^645530055 is an apocalyptic number.

645530055 is a deficient number, since it is larger than the sum of its proper divisors (387651609).

645530055 is a wasteful number, since it uses less digits than its factorization.

645530055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13906.

The product of its (nonzero) digits is 45000, while the sum is 33.

The square root of 645530055 is about 25407.2835029643. The cubic root of 645530055 is about 864.2488740464.

The spelling of 645530055 in words is "six hundred forty-five million, five hundred thirty thousand, fifty-five".