642101662154 has 8 divisors (see below), whose sum is σ = 996364648260. Its totient is φ = 309980112736.

The previous prime is 642101662141. The next prime is 642101662159. The reversal of 642101662154 is 451266101246.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 574150206529 + 67951455625 = 757727^2 + 260675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (642101662159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5535359099 + ... + 5535359214.

Almost surely, 2^642101662154 is an apocalyptic number.

642101662154 is a deficient number, since it is larger than the sum of its proper divisors (354262986106).

642101662154 is a wasteful number, since it uses less digits than its factorization.

642101662154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11070718344.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 642101662154 in words is "six hundred forty-two billion, one hundred one million, six hundred sixty-two thousand, one hundred fifty-four".