642663125 has 80 divisors (see below), whose sum is σ = 955194240. Its totient is φ = 427680000.

The previous prime is 642663089. The next prime is 642663149. The reversal of 642663125 is 521366246.

It is a happy number.

It is not a de Polignac number, because 642663125 - 2¹² = 642659029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3550535 + ... + 3550715.

It is an arithmetic number, because the mean of its divisors is an integer number (11939928).

Almost surely, 2^642663125 is an apocalyptic number.

642663125 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

642663125 is a deficient number, since it is larger than the sum of its proper divisors (312531115).

642663125 is a wasteful number, since it uses less digits than its factorization.

642663125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 241 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 642663125 is about 25350.8012693879. The cubic root of 642663125 is about 862.9675403927.

The spelling of 642663125 in words is "six hundred forty-two million, six hundred sixty-three thousand, one hundred twenty-five".