642153544 has 16 divisors (see below), whose sum is σ = 1204354620. Its totient is φ = 320992320.

The previous prime is 642153539. The next prime is 642153559. The reversal of 642153544 is 445351246.

It can be written as a sum of positive squares in 2 ways, for example, as 641608900 + 544644 = 25330^2 + 738^2 .

It is a super-2 number, since 2×642153544² = 824722348143519872, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31714 + ... + 47854.

Almost surely, 2^642153544 is an apocalyptic number.

It is an amenable number.

642153544 is a deficient number, since it is larger than the sum of its proper divisors (562201076).

642153544 is a wasteful number, since it uses less digits than its factorization.

642153544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21120 (or 21116 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

The square root of 642153544 is about 25340.7486866509. The cubic root of 642153544 is about 862.7393917584.

The spelling of 642153544 in words is "six hundred forty-two million, one hundred fifty-three thousand, five hundred forty-four".