642154721416 has 48 divisors (see below), whose sum is σ = 1315179665100. Its totient is φ = 292204510080.

The previous prime is 642154721401. The next prime is 642154721447. The reversal of 642154721416 is 614127451246.

It can be written as a sum of positive squares in 2 ways, for example, as 629410569316 + 12744152100 = 793354^2 + 112890^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88171 + ... + 1136698.

Almost surely, 2^642154721416 is an apocalyptic number.

It is an amenable number.

642154721416 is an abundant number, since it is smaller than the sum of its proper divisors (673024943684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642154721416 is a wasteful number, since it uses less digits than its factorization.

642154721416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225030 (or 1224955 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The spelling of 642154721416 in words is "six hundred forty-two billion, one hundred fifty-four million, seven hundred twenty-one thousand, four hundred sixteen".