8001545642 has 4 divisors (see below), whose sum is σ = 12002318466. Its totient is φ = 4000772820.

The previous prime is 8001545641. The next prime is 8001545689. The reversal of 8001545642 is 2465451008.

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., 7931505481 + 70040161 = 89059^2 + 8369^2 .

It is a super-2 number, since 2×8001545642² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8001545641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000386409 + ... + 2000386412.

Almost surely, 2^8001545642 is an apocalyptic number.

8001545642 is a deficient number, since it is larger than the sum of its proper divisors (4000772824).

8001545642 is a wasteful number, since it uses less digits than its factorization.

8001545642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000772823.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 8001545642 is about 89451.3590841414. The cubic root of 8001545642 is about 2000.1287952057.

The spelling of 8001545642 in words is "eight billion, one million, five hundred forty-five thousand, six hundred forty-two".