51005066161616 has 30 divisors (see below), whose sum is σ = 114956571312450. Its totient is φ = 21859314068928.

The previous prime is 51005066161603. The next prime is 51005066161631. The reversal of 51005066161616 is 61616166050015.

It can be written as a sum of positive squares in only one way, i.e., 49453805875600 + 1551260286016 = 7032340^2 + 1245496^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32528740391 + ... + 32528741958.

It is an arithmetic number, because the mean of its divisors is an integer number (3831885710415).

Almost surely, 2^{51005066161616} is an apocalyptic number.

51005066161616 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51005066161616 is an abundant number, since it is smaller than the sum of its proper divisors (63951505150834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51005066161616 is a wasteful number, since it uses less digits than its factorization.

51005066161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65057482371 (or 65057482358 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 51005066161616 in words is "fifty-one trillion, five billion, sixty-six million, one hundred sixty-one thousand, six hundred sixteen".