8513563642 has 4 divisors (see below), whose sum is σ = 12770345466. Its totient is φ = 4256781820.

The previous prime is 8513563633. The next prime is 8513563693. The reversal of 8513563642 is 2463653158.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8484067881 + 29495761 = 92109^2 + 5431^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128390909 + ... + 2128390912.

Almost surely, 2^8513563642 is an apocalyptic number.

8513563642 is a deficient number, since it is larger than the sum of its proper divisors (4256781824).

8513563642 is a wasteful number, since it uses less digits than its factorization.

8513563642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256781823.

The product of its digits is 518400, while the sum is 43.

The square root of 8513563642 is about 92268.9744280275. The cubic root of 8513563642 is about 2041.9125056082.

The spelling of 8513563642 in words is "eight billion, five hundred thirteen million, five hundred sixty-three thousand, six hundred forty-two".