51520635011211 has 4 divisors (see below), whose sum is σ = 68694180014952. Its totient is φ = 34347090007472.

The previous prime is 51520635011191. The next prime is 51520635011231. The reversal of 51520635011211 is 11211053602515.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51520635011191) and next prime (51520635011231).

It is a cyclic number.

It is not a de Polignac number, because 51520635011211 - 2⁵ = 51520635011179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51520635011231) 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, 8586772501866 + ... + 8586772501871.

It is an arithmetic number, because the mean of its divisors is an integer number (17173545003738).

Almost surely, 2^{51520635011211} is an apocalyptic number.

51520635011211 is a deficient number, since it is larger than the sum of its proper divisors (17173545003741).

51520635011211 is a wasteful number, since it uses less digits than its factorization.

51520635011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17173545003740.

The product of its (nonzero) digits is 9000, while the sum is 33.

Adding to 51520635011211 its reverse (11211053602515), we get a palindrome (62731688613726).

The spelling of 51520635011211 in words is "fifty-one trillion, five hundred twenty billion, six hundred thirty-five million, eleven thousand, two hundred eleven".