645158874471 has 4 divisors (see below), whose sum is σ = 860211832632. Its totient is φ = 430105916312.

The previous prime is 645158874439. The next prime is 645158874553. The reversal of 645158874471 is 174478851546.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 645158874471 - 2⁵ = 645158874439 is a prime.

It is a super-3 number, since 3×645158874471³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645158874401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107526479076 + ... + 107526479081.

It is an arithmetic number, because the mean of its divisors is an integer number (215052958158).

Almost surely, 2^645158874471 is an apocalyptic number.

645158874471 is a deficient number, since it is larger than the sum of its proper divisors (215052958161).

645158874471 is a wasteful number, since it uses less digits than its factorization.

645158874471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215052958160.

The product of its digits is 30105600, while the sum is 60.

The spelling of 645158874471 in words is "six hundred forty-five billion, one hundred fifty-eight million, eight hundred seventy-four thousand, four hundred seventy-one".