5251643642 has 16 divisors (see below), whose sum is σ = 9003748992. Its totient is φ = 2250471600.

The previous prime is 5251643609. The next prime is 5251643687. The reversal of 5251643642 is 2463461525.

It is a junction number, because it is equal to n+sod(n) for n = 5251643596 and 5251643605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245267 + ... + 265817.

It is an arithmetic number, because the mean of its divisors is an integer number (562734312).

Almost surely, 2^5251643642 is an apocalyptic number.

5251643642 is a deficient number, since it is larger than the sum of its proper divisors (3752105350).

5251643642 is a wasteful number, since it uses less digits than its factorization.

5251643642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38813.

The product of its digits is 172800, while the sum is 38.

The square root of 5251643642 is about 72468.2250507076. The cubic root of 5251643642 is about 1738.1946794990.

The spelling of 5251643642 in words is "five billion, two hundred fifty-one million, six hundred forty-three thousand, six hundred forty-two".