20351643165541 has 4 divisors (see below), whose sum is σ = 20351684968992. Its totient is φ = 20351601362092.

The previous prime is 20351643165527. The next prime is 20351643165551. The reversal of 20351643165541 is 14556134615302.

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 20351643165541 - 2²¹ = 20351641068389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20351643165491 and 20351643165500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351643165551) 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, 20162755 + ... + 21148048.

It is an arithmetic number, because the mean of its divisors is an integer number (5087921242248).

Almost surely, 2^{20351643165541} is an apocalyptic number.

It is an amenable number.

20351643165541 is a deficient number, since it is larger than the sum of its proper divisors (41803451).

20351643165541 is an equidigital number, since it uses as much as digits as its factorization.

20351643165541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41803450.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 20351643165541 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-three million, one hundred sixty-five thousand, five hundred forty-one".