9999170642 has 4 divisors (see below), whose sum is σ = 14998755966. Its totient is φ = 4999585320.

The previous prime is 9999170633. The next prime is 9999170659. The reversal of 9999170642 is 2460719999.

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., 9698113441 + 301057201 = 98479^2 + 17351^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499792659 + ... + 2499792662.

Almost surely, 2^9999170642 is an apocalyptic number.

9999170642 is a deficient number, since it is larger than the sum of its proper divisors (4999585324).

9999170642 is a wasteful number, since it uses less digits than its factorization.

9999170642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999585323.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The square root of 9999170642 is about 99995.8531240171. The cubic root of 9999170642 is about 2154.3751284637.

The spelling of 9999170642 in words is "nine billion, nine hundred ninety-nine million, one hundred seventy thousand, six hundred forty-two".