51061603433221 has 8 divisors (see below), whose sum is σ = 52922762798840. Its totient is φ = 49225765963968.

The previous prime is 51061603433219. The next prime is 51061603433261. The reversal of 51061603433221 is 12233430616015.

It can be written as a sum of positive squares in 4 ways, for example, as 9610682012100 + 41450921421121 = 3100110^2 + 6438239^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51061603433221 - 2¹ = 51061603433219 is a prime.

It is a super-2 number, since 2×51061603433221² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51061603433261) 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, 6330469986 + ... + 6330478051.

It is an arithmetic number, because the mean of its divisors is an integer number (6615345349855).

Almost surely, 2^{51061603433221} is an apocalyptic number.

It is an amenable number.

51061603433221 is a deficient number, since it is larger than the sum of its proper divisors (1861159365619).

51061603433221 is a wasteful number, since it uses less digits than its factorization.

51061603433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12660948183.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 51061603433221 in words is "fifty-one trillion, sixty-one billion, six hundred three million, four hundred thirty-three thousand, two hundred twenty-one".