646125142 has 8 divisors (see below), whose sum is σ = 1043740656. Its totient is φ = 298211592.

The previous prime is 646125113. The next prime is 646125163. The reversal of 646125142 is 241521646.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 12425458 + ... + 12425509.

It is an arithmetic number, because the mean of its divisors is an integer number (130467582).

Almost surely, 2^646125142 is an apocalyptic number.

646125142 is a deficient number, since it is larger than the sum of its proper divisors (397615514).

646125142 is a wasteful number, since it uses less digits than its factorization.

646125142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24850982.

The product of its digits is 11520, while the sum is 31.

The square root of 646125142 is about 25418.9917581323. The cubic root of 646125142 is about 864.5143640410.

Adding to 646125142 its reverse (241521646), we get a palindrome (887646788).

The spelling of 646125142 in words is "six hundred forty-six million, one hundred twenty-five thousand, one hundred forty-two".