642063161 has 16 divisors (see below), whose sum is σ = 674472960. Its totient is φ = 610411200.

The previous prime is 642063151. The next prime is 642063173. The reversal of 642063161 is 161360246.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642063161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642063151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 652676 + ... + 653658.

It is an arithmetic number, because the mean of its divisors is an integer number (42154560).

Almost surely, 2^642063161 is an apocalyptic number.

It is an amenable number.

642063161 is a deficient number, since it is larger than the sum of its proper divisors (32409799).

642063161 is a wasteful number, since it uses less digits than its factorization.

642063161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 642063161 is about 25338.9652709024. The cubic root of 642063161 is about 862.6989130526.

The spelling of 642063161 in words is "six hundred forty-two million, sixty-three thousand, one hundred sixty-one".