51561408877 has 8 divisors (see below), whose sum is σ = 56292462720. Its totient is φ = 46837630560.

The previous prime is 51561408839. The next prime is 51561408911. The reversal of 51561408877 is 77880416515.

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 51561408877 - 2⁷ = 51561408749 is a prime.

It is a super-2 number, since 2×51561408877² (a number of 22 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 (51561408677) 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, 1804053 + ... + 1832410.

It is an arithmetic number, because the mean of its divisors is an integer number (7036557840).

Almost surely, 2^51561408877 is an apocalyptic number.

It is an amenable number.

51561408877 is a deficient number, since it is larger than the sum of its proper divisors (4731053843).

51561408877 is a wasteful number, since it uses less digits than its factorization.

51561408877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637763.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 51561408877 in words is "fifty-one billion, five hundred sixty-one million, four hundred eight thousand, eight hundred seventy-seven".