65422431821 has 4 divisors (see below), whose sum is σ = 67190605692. Its totient is φ = 63654257952.

The previous prime is 65422431799. The next prime is 65422431839. The reversal of 65422431821 is 12813422456.

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 36356955625 + 29065476196 = 190675^2 + 170486^2 .

It is a cyclic number.

It is not a de Polignac number, because 65422431821 - 2¹⁸ = 65422169677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65422431721) 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, 884086880 + ... + 884086953.

It is an arithmetic number, because the mean of its divisors is an integer number (16797651423).

Almost surely, 2^65422431821 is an apocalyptic number.

It is an amenable number.

65422431821 is a deficient number, since it is larger than the sum of its proper divisors (1768173871).

65422431821 is a wasteful number, since it uses less digits than its factorization.

65422431821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768173870.

The product of its digits is 92160, while the sum is 38.

The spelling of 65422431821 in words is "sixty-five billion, four hundred twenty-two million, four hundred thirty-one thousand, eight hundred twenty-one".