555378687881 has 2 divisors, whose sum is σ = 555378687882. Its totient is φ = 555378687880.

The previous prime is 555378687847. The next prime is 555378687907. The reversal of 555378687881 is 188786873555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323921477881 + 231457210000 = 569141^2 + 481100^2 .

It is a cyclic number.

It is not a de Polignac number, because 555378687881 - 2²² = 555374493577 is a prime.

It is a super-2 number, since 2×555378687881² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (555378687181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277689343940 + 277689343941.

It is an arithmetic number, because the mean of its divisors is an integer number (277689343941).

Almost surely, 2^555378687881 is an apocalyptic number.

It is an amenable number.

555378687881 is a deficient number, since it is larger than the sum of its proper divisors (1).

555378687881 is an equidigital number, since it uses as much as digits as its factorization.

555378687881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584000, while the sum is 71.

The spelling of 555378687881 in words is "five hundred fifty-five billion, three hundred seventy-eight million, six hundred eighty-seven thousand, eight hundred eighty-one".