642472101274247 has 4 divisors (see below), whose sum is σ = 645353142087360. Its totient is φ = 639591060461136.

The previous prime is 642472101274153. The next prime is 642472101274261. The reversal of 642472101274247 is 742472101274246.

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 642472101274247 - 2¹⁸ = 642472101012103 is a prime.

It is a super-2 number, since 2×642472101274247² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642472101274277) 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, 1440520406222 + ... + 1440520406667.

It is an arithmetic number, because the mean of its divisors is an integer number (161338285521840).

Almost surely, 2^{642472101274247} is an apocalyptic number.

642472101274247 is a deficient number, since it is larger than the sum of its proper divisors (2881040813113).

642472101274247 is a wasteful number, since it uses less digits than its factorization.

642472101274247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881040813112.

The product of its (nonzero) digits is 8429568, while the sum is 53.

Subtracting 642472101274247 from its reverse (742472101274246), we obtain a palindrome (99999999999999).

The spelling of 642472101274247 in words is "six hundred forty-two trillion, four hundred seventy-two billion, one hundred one million, two hundred seventy-four thousand, two hundred forty-seven".