642964484249 has 4 divisors (see below), whose sum is σ = 642968381136. Its totient is φ = 642960587364.

The previous prime is 642964484221. The next prime is 642964484251. The reversal of 642964484249 is 942484469246.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-642964484249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642964484191 and 642964484200.

It is not an unprimeable number, because it can be changed into a prime (642964484849) 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, 1689479 + ... + 2034764.

It is an arithmetic number, because the mean of its divisors is an integer number (160742095284).

Almost surely, 2^642964484249 is an apocalyptic number.

It is an amenable number.

642964484249 is a deficient number, since it is larger than the sum of its proper divisors (3896887).

642964484249 is a wasteful number, since it uses less digits than its factorization.

642964484249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3896886.

The product of its digits is 95551488, while the sum is 62.

The spelling of 642964484249 in words is "six hundred forty-two billion, nine hundred sixty-four million, four hundred eighty-four thousand, two hundred forty-nine".