51642011660201 has 4 divisors (see below), whose sum is σ = 51642026044752. Its totient is φ = 51641997275652.

The previous prime is 51642011660189. The next prime is 51642011660231. The reversal of 51642011660201 is 10206611024615.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51642011660201 - 2¹⁸ = 51642011398057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51642011660231) 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, 3154190 + ... + 10641096.

It is an arithmetic number, because the mean of its divisors is an integer number (12910506511188).

Almost surely, 2^{51642011660201} is an apocalyptic number.

It is an amenable number.

51642011660201 is a deficient number, since it is larger than the sum of its proper divisors (14384551).

51642011660201 is an equidigital number, since it uses as much as digits as its factorization.

51642011660201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14384550.

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 51642011660201 its reverse (10206611024615), we get a palindrome (61848622684816).

The spelling of 51642011660201 in words is "fifty-one trillion, six hundred forty-two billion, eleven million, six hundred sixty thousand, two hundred one".