642516453 has 24 divisors (see below), whose sum is σ = 954397080. Its totient is φ = 416279040.

The previous prime is 642516451. The next prime is 642516467. The reversal of 642516453 is 354615246.

642516453 is a `hidden beast` number, since 6 + 4 + 2 + 5 + 1 + 645 + 3 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 64931364 + 577585089 = 8058^2 + 24033^2 .

It is not a de Polignac number, because 642516453 - 2¹ = 642516451 is a prime.

It is a congruent number.

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

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 23 ways as a sum of consecutive naturals, for example, 96025 + ... + 102497.

It is an arithmetic number, because the mean of its divisors is an integer number (39766545).

Almost surely, 2^642516453 is an apocalyptic number.

It is an amenable number.

642516453 is a deficient number, since it is larger than the sum of its proper divisors (311880627).

642516453 is a wasteful number, since it uses less digits than its factorization.

642516453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789 (or 6786 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 642516453 is about 25347.9082568957. The cubic root of 642516453 is about 862.9018850488.

The spelling of 642516453 in words is "six hundred forty-two million, five hundred sixteen thousand, four hundred fifty-three".