20466663742501 has 4 divisors (see below), whose sum is σ = 20490489894400. Its totient is φ = 20442837590604.

The previous prime is 20466663742451. The next prime is 20466663742513. The reversal of 20466663742501 is 10524736666402.

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 not a de Polignac number, because 20466663742501 - 2²¹ = 20466661645349 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 (20466663742561) 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, 11913074661 + ... + 11913076378.

It is an arithmetic number, because the mean of its divisors is an integer number (5122622473600).

Almost surely, 2^{20466663742501} is an apocalyptic number.

It is an amenable number.

20466663742501 is a deficient number, since it is larger than the sum of its proper divisors (23826151899).

20466663742501 is an equidigital number, since it uses as much as digits as its factorization.

20466663742501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23826151898.

The product of its (nonzero) digits is 8709120, while the sum is 52.

The spelling of 20466663742501 in words is "twenty trillion, four hundred sixty-six billion, six hundred sixty-three million, seven hundred forty-two thousand, five hundred one".