649443142540 has 12 divisors (see below), whose sum is σ = 1363830599376. Its totient is φ = 259777257008.

The previous prime is 649443142483. The next prime is 649443142553. The reversal of 649443142540 is 45241344946.

It is a happy number.

It is an unprimeable number.

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, 16236078544 + ... + 16236078583.

It is an arithmetic number, because the mean of its divisors is an integer number (113652549948).

Almost surely, 2^649443142540 is an apocalyptic number.

It is an amenable number.

649443142540 is an abundant number, since it is smaller than the sum of its proper divisors (714387456836).

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

649443142540 is a wasteful number, since it uses less digits than its factorization.

649443142540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32472157136 (or 32472157134 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 46.

The spelling of 649443142540 in words is "six hundred forty-nine billion, four hundred forty-three million, one hundred forty-two thousand, five hundred forty".