642516452 has 6 divisors (see below), whose sum is σ = 1124403798. Its totient is φ = 321258224.

The previous prime is 642516451. The next prime is 642516467. The reversal of 642516452 is 254615246.

It can be written as a sum of positive squares in only one way, i.e., 471063616 + 171452836 = 21704^2 + 13094^2 .

It is not an unprimeable number, because it can be changed into a prime (642516451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80314553 + ... + 80314560.

It is an arithmetic number, because the mean of its divisors is an integer number (187400633).

Almost surely, 2^642516452 is an apocalyptic number.

It is an amenable number.

642516452 is a deficient number, since it is larger than the sum of its proper divisors (481887346).

642516452 is a wasteful number, since it uses less digits than its factorization.

642516452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160629117 (or 160629115 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 642516452 is about 25347.9082371702. The cubic root of 642516452 is about 862.9018846012.

The spelling of 642516452 in words is "six hundred forty-two million, five hundred sixteen thousand, four hundred fifty-two".