51100500550061 has 6 divisors (see below), whose sum is σ = 52082852646090. Its totient is φ = 50136340159568.

The previous prime is 51100500550009. The next prime is 51100500550067. The reversal of 51100500550061 is 16005500500115.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13344452836036 + 37756047714025 = 3653006^2 + 6144595^2 .

It is not a de Polignac number, because 51100500550061 - 2¹⁰ = 51100500549037 is a prime.

It is a super-2 number, since 2×51100500550061² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51100500550067) 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, 9095849906 + ... + 9095855523.

It is an arithmetic number, because the mean of its divisors is an integer number (8680475441015).

Almost surely, 2^{51100500550061} is an apocalyptic number.

It is an amenable number.

51100500550061 is a deficient number, since it is larger than the sum of its proper divisors (982352096029).

51100500550061 is an equidigital number, since it uses as much as digits as its factorization.

51100500550061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18191705535 (or 18191705482 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 51100500550061 in words is "fifty-one trillion, one hundred billion, five hundred million, five hundred fifty thousand, sixty-one".