642151250161 has 4 divisors (see below), whose sum is σ = 675948684400. Its totient is φ = 608353815924.

The previous prime is 642151250159. The next prime is 642151250197. The reversal of 642151250161 is 161052151246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642151250161 - 2¹ = 642151250159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642151250131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16898717091 + ... + 16898717128.

It is an arithmetic number, because the mean of its divisors is an integer number (168987171100).

Almost surely, 2^642151250161 is an apocalyptic number.

It is an amenable number.

642151250161 is a deficient number, since it is larger than the sum of its proper divisors (33797434239).

642151250161 is a wasteful number, since it uses less digits than its factorization.

642151250161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33797434238.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 642151250161 in words is "six hundred forty-two billion, one hundred fifty-one million, two hundred fifty thousand, one hundred sixty-one".