643158947490 has 64 divisors (see below), whose sum is σ = 1577632896000. Its totient is φ = 167754780864.

The previous prime is 643158947443. The next prime is 643158947503. The reversal of 643158947490 is 94749851346.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 560752 + ... + 1265211.

It is an arithmetic number, because the mean of its divisors is an integer number (24650514000).

Almost surely, 2^643158947490 is an apocalyptic number.

643158947490 is an abundant number, since it is smaller than the sum of its proper divisors (934473948510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643158947490 is a wasteful number, since it uses less digits than its factorization.

643158947490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826231.

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 643158947490 in words is "six hundred forty-three billion, one hundred fifty-eight million, nine hundred forty-seven thousand, four hundred ninety".