75554476981 has 2 divisors, whose sum is σ = 75554476982. Its totient is φ = 75554476980.

The previous prime is 75554476979. The next prime is 75554477057. The reversal of 75554476981 is 18967445557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72288925956 + 3265551025 = 268866^2 + 57145^2 .

It is a cyclic number.

It is not a de Polignac number, because 75554476981 - 2¹ = 75554476979 is a prime.

It is a super-2 number, since 2×75554476981² (a number of 23 digits) contains 22 as substring.

Together with 75554476979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75554486981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37777238490 + 37777238491.

It is an arithmetic number, because the mean of its divisors is an integer number (37777238491).

Almost surely, 2^75554476981 is an apocalyptic number.

It is an amenable number.

75554476981 is a deficient number, since it is larger than the sum of its proper divisors (1).

75554476981 is an equidigital number, since it uses as much as digits as its factorization.

75554476981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336000, while the sum is 61.

The spelling of 75554476981 in words is "seventy-five billion, five hundred fifty-four million, four hundred seventy-six thousand, nine hundred eighty-one".