642454550401 has 4 divisors (see below), whose sum is σ = 647143999812. Its totient is φ = 637765100992.

The previous prime is 642454550383. The next prime is 642454550407. The reversal of 642454550401 is 104055454246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 538286342400 + 104168208001 = 733680^2 + 322751^2 .

It is a cyclic number.

It is not a de Polignac number, because 642454550401 - 2⁷ = 642454550273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642454550407) 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, 2344724500 + ... + 2344724773.

It is an arithmetic number, because the mean of its divisors is an integer number (161785999953).

Almost surely, 2^642454550401 is an apocalyptic number.

It is an amenable number.

642454550401 is a deficient number, since it is larger than the sum of its proper divisors (4689449411).

642454550401 is a wasteful number, since it uses less digits than its factorization.

642454550401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689449410.

The product of its (nonzero) digits is 384000, while the sum is 40.

The spelling of 642454550401 in words is "six hundred forty-two billion, four hundred fifty-four million, five hundred fifty thousand, four hundred one".