75561496991 has 2 divisors, whose sum is σ = 75561496992. Its totient is φ = 75561496990.

The previous prime is 75561496973. The next prime is 75561496993. The reversal of 75561496991 is 19969416557.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75561496991 - 2¹⁴ = 75561480607 is a prime.

Together with 75561496993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75561496993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37780748495 + 37780748496.

It is an arithmetic number, because the mean of its divisors is an integer number (37780748496).

Almost surely, 2^75561496991 is an apocalyptic number.

75561496991 is a deficient number, since it is larger than the sum of its proper divisors (1).

75561496991 is an equidigital number, since it uses as much as digits as its factorization.

75561496991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18370800, while the sum is 62.

The spelling of 75561496991 in words is "seventy-five billion, five hundred sixty-one million, four hundred ninety-six thousand, nine hundred ninety-one".