643107157 has 32 divisors (see below), whose sum is σ = 829108224. Its totient is φ = 484324800.

The previous prime is 643107149. The next prime is 643107191. The reversal of 643107157 is 751701346.

It is a cyclic number.

It is not a de Polignac number, because 643107157 - 2³ = 643107149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643107197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299307 + ... + 301447.

It is an arithmetic number, because the mean of its divisors is an integer number (25909632).

Almost surely, 2^643107157 is an apocalyptic number.

It is an amenable number.

643107157 is a deficient number, since it is larger than the sum of its proper divisors (186001067).

643107157 is a wasteful number, since it uses less digits than its factorization.

643107157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 643107157 is about 25359.5575079693. The cubic root of 643107157 is about 863.1662432440.

The spelling of 643107157 in words is "six hundred forty-three million, one hundred seven thousand, one hundred fifty-seven".