642376161 has 48 divisors (see below), whose sum is σ = 1129624704. Its totient is φ = 343383552.

The previous prime is 642376159. The next prime is 642376171. The reversal of 642376161 is 161673246.

It is a happy number.

642376161 is a `hidden beast` number, since 6 + 4 + 2 + 37 + 616 + 1 = 666.

It is not a de Polignac number, because 642376161 - 2¹ = 642376159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642376171) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 183550 + ... + 187016.

It is an arithmetic number, because the mean of its divisors is an integer number (23533848).

Almost surely, 2^642376161 is an apocalyptic number.

It is an amenable number.

642376161 is a deficient number, since it is larger than the sum of its proper divisors (487248543).

642376161 is a wasteful number, since it uses less digits than its factorization.

642376161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670 (or 3667 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 642376161 is about 25345.1407768827. The cubic root of 642376161 is about 862.8390762587.

The spelling of 642376161 in words is "six hundred forty-two million, three hundred seventy-six thousand, one hundred sixty-one".