51606541021 has 8 divisors (see below), whose sum is σ = 58980373184. Its totient is φ = 44233076160.

The previous prime is 51606541001. The next prime is 51606541057. The reversal of 51606541021 is 12014560615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51606541021 - 2¹⁵ = 51606508253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51606541001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352786 + ... + 477148.

It is an arithmetic number, because the mean of its divisors is an integer number (7372546648).

Almost surely, 2^51606541021 is an apocalyptic number.

It is an amenable number.

51606541021 is a deficient number, since it is larger than the sum of its proper divisors (7373832163).

51606541021 is a wasteful number, since it uses less digits than its factorization.

51606541021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183651.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 51606541021 in words is "fifty-one billion, six hundred six million, five hundred forty-one thousand, twenty-one".