642142011 has 24 divisors (see below), whose sum is σ = 1014779664. Its totient is φ = 360010560.

The previous prime is 642141971. The next prime is 642142027. The reversal of 642142011 is 110241246.

It is a happy number.

It is not a de Polignac number, because 642142011 - 2¹⁵ = 642109243 is a prime.

It is a super-2 number, since 2×642142011² = 824692724582248242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (642141011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33420 + ... + 49001.

It is an arithmetic number, because the mean of its divisors is an integer number (42282486).

Almost surely, 2^642142011 is an apocalyptic number.

642142011 is a deficient number, since it is larger than the sum of its proper divisors (372637653).

642142011 is a wasteful number, since it uses less digits than its factorization.

642142011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82491 (or 82484 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 642142011 is about 25340.5211272381. The cubic root of 642142011 is about 862.7342268291.

Adding to 642142011 its reverse (110241246), we get a palindrome (752383257).

The spelling of 642142011 in words is "six hundred forty-two million, one hundred forty-two thousand, eleven".