51555150505561 has 16 divisors (see below), whose sum is σ = 52827857913600. Its totient is φ = 50289953632128.

The previous prime is 51555150505553. The next prime is 51555150505603. The reversal of 51555150505561 is 16550505155515.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51555150505561 - 2³ = 51555150505553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555150505501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24516175 + ... + 26535883.

It is an arithmetic number, because the mean of its divisors is an integer number (3301741119600).

Almost surely, 2^{51555150505561} is an apocalyptic number.

It is an amenable number.

51555150505561 is a deficient number, since it is larger than the sum of its proper divisors (1272707408039).

51555150505561 is a wasteful number, since it uses less digits than its factorization.

51555150505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021568.

The product of its (nonzero) digits is 2343750, while the sum is 49.

The spelling of 51555150505561 in words is "fifty-one trillion, five hundred fifty-five billion, one hundred fifty million, five hundred five thousand, five hundred sixty-one".