51117168141621 has 6 divisors (see below), whose sum is σ = 73835909537910. Its totient is φ = 34078112094408.

The previous prime is 51117168141577. The next prime is 51117168141709. The reversal of 51117168141621 is 12614186171115.

51117168141621 is a `hidden beast` number, since 5 + 1 + 1 + 1 + 7 + 1 + 6 + 8 + 14 + 1 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 49111517377521 + 2005650764100 = 7007961^2 + 1416210^2 .

It is not a de Polignac number, because 51117168141621 - 2¹⁹ = 51117167617333 is a prime.

It is a super-2 number, since 2×51117168141621² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51117168143621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2839842674526 + ... + 2839842674543.

It is an arithmetic number, because the mean of its divisors is an integer number (12305984922985).

Almost surely, 2^{51117168141621} is an apocalyptic number.

It is an amenable number.

51117168141621 is a deficient number, since it is larger than the sum of its proper divisors (22718741396289).

51117168141621 is a wasteful number, since it uses less digits than its factorization.

51117168141621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5679685349075 (or 5679685349072 counting only the distinct ones).

The product of its digits is 80640, while the sum is 45.

The spelling of 51117168141621 in words is "fifty-one trillion, one hundred seventeen billion, one hundred sixty-eight million, one hundred forty-one thousand, six hundred twenty-one".