642165170 has 16 divisors (see below), whose sum is σ = 1159847640. Its totient is φ = 255988224.

The previous prime is 642165149. The next prime is 642165179. The reversal of 642165170 is 71561246.

It can be written as a sum of positive squares in 4 ways, for example, as 641963569 + 201601 = 25337^2 + 449^2 .

It is a super-2 number, since 2×642165170² = 824752211122257800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642165179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106655 + ... + 112514.

Almost surely, 2^642165170 is an apocalyptic number.

642165170 is a deficient number, since it is larger than the sum of its proper divisors (517682470).

642165170 is a wasteful number, since it uses less digits than its factorization.

642165170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219469.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 642165170 is about 25340.9780789929. The cubic root of 642165170 is about 862.7445982741.

The spelling of 642165170 in words is "six hundred forty-two million, one hundred sixty-five thousand, one hundred seventy".