642512020423 has 16 divisors (see below), whose sum is σ = 792394638336. Its totient is φ = 507325764960.

The previous prime is 642512020351. The next prime is 642512020429. The reversal of 642512020423 is 324020215246.

It is not a de Polignac number, because 642512020423 - 2²¹ = 642509923271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642512020429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7145311 + ... + 7234672.

It is an arithmetic number, because the mean of its divisors is an integer number (49524664896).

Almost surely, 2^642512020423 is an apocalyptic number.

642512020423 is a deficient number, since it is larger than the sum of its proper divisors (149882617913).

642512020423 is a wasteful number, since it uses less digits than its factorization.

642512020423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14380494.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 642512020423 its reverse (324020215246), we get a palindrome (966532235669).

The spelling of 642512020423 in words is "six hundred forty-two billion, five hundred twelve million, twenty thousand, four hundred twenty-three".