75149383681 has 2 divisors, whose sum is σ = 75149383682. Its totient is φ = 75149383680.

The previous prime is 75149383657. The next prime is 75149383693. The reversal of 75149383681 is 18638394157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74310760000 + 838623681 = 272600^2 + 28959^2 .

It is a cyclic number.

It is not a de Polignac number, because 75149383681 - 2²⁹ = 74612512769 is a prime.

It is a super-2 number, since 2×75149383681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75149383781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37574691840 + 37574691841.

It is an arithmetic number, because the mean of its divisors is an integer number (37574691841).

Almost surely, 2^75149383681 is an apocalyptic number.

It is an amenable number.

75149383681 is a deficient number, since it is larger than the sum of its proper divisors (1).

75149383681 is an equidigital number, since it uses as much as digits as its factorization.

75149383681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The spelling of 75149383681 in words is "seventy-five billion, one hundred forty-nine million, three hundred eighty-three thousand, six hundred eighty-one".