501556055551 has 2 divisors, whose sum is σ = 501556055552. Its totient is φ = 501556055550.

The previous prime is 501556055543. The next prime is 501556055573. The reversal of 501556055551 is 155550655105.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 501556055551 - 2³ = 501556055543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 501556055498 and 501556055507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501556055521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250778027775 + 250778027776.

It is an arithmetic number, because the mean of its divisors is an integer number (250778027776).

Almost surely, 2^501556055551 is an apocalyptic number.

501556055551 is a deficient number, since it is larger than the sum of its proper divisors (1).

501556055551 is an equidigital number, since it uses as much as digits as its factorization.

501556055551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 468750, while the sum is 43.

The spelling of 501556055551 in words is "five hundred one billion, five hundred fifty-six million, fifty-five thousand, five hundred fifty-one".