51110521561 has 8 divisors (see below), whose sum is σ = 55761300000. Its totient is φ = 46460471040.

The previous prime is 51110521559. The next prime is 51110521597. The reversal of 51110521561 is 16512501115.

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 51110521561 - 2¹ = 51110521559 is a prime.

It is a super-2 number, since 2×51110521561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51110521541) 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, 29611 + ... + 321088.

It is an arithmetic number, because the mean of its divisors is an integer number (6970162500).

Almost surely, 2^51110521561 is an apocalyptic number.

It is an amenable number.

51110521561 is a deficient number, since it is larger than the sum of its proper divisors (4650778439).

51110521561 is a wasteful number, since it uses less digits than its factorization.

51110521561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363959.

The product of its (nonzero) digits is 1500, while the sum is 28.

The spelling of 51110521561 in words is "fifty-one billion, one hundred ten million, five hundred twenty-one thousand, five hundred sixty-one".