642465575447 has 4 divisors (see below), whose sum is σ = 670398861360. Its totient is φ = 614532289536.

The previous prime is 642465575443. The next prime is 642465575449. The reversal of 642465575447 is 744575564246.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 642465575447 - 2² = 642465575443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642465575443) 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, 13966642922 + ... + 13966642967.

It is an arithmetic number, because the mean of its divisors is an integer number (167599715340).

Almost surely, 2^642465575447 is an apocalyptic number.

642465575447 is a deficient number, since it is larger than the sum of its proper divisors (27933285913).

642465575447 is a wasteful number, since it uses less digits than its factorization.

642465575447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27933285912.

The product of its digits is 112896000, while the sum is 59.

The spelling of 642465575447 in words is "six hundred forty-two billion, four hundred sixty-five million, five hundred seventy-five thousand, four hundred forty-seven".