75399106681 has 2 divisors, whose sum is σ = 75399106682. Its totient is φ = 75399106680.

The previous prime is 75399106637. The next prime is 75399106687. The reversal of 75399106681 is 18660199357.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56150041600 + 19249065081 = 236960^2 + 138741^2 .

It is a cyclic number.

It is not a de Polignac number, because 75399106681 - 2⁷ = 75399106553 is a prime.

It is a super-2 number, since 2×75399106681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75399106687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37699553340 + 37699553341.

It is an arithmetic number, because the mean of its divisors is an integer number (37699553341).

Almost surely, 2^75399106681 is an apocalyptic number.

It is an amenable number.

75399106681 is a deficient number, since it is larger than the sum of its proper divisors (1).

75399106681 is an equidigital number, since it uses as much as digits as its factorization.

75399106681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 75399106681 in words is "seventy-five billion, three hundred ninety-nine million, one hundred six thousand, six hundred eighty-one".