7235998867681 has 2 divisors, whose sum is σ = 7235998867682. Its totient is φ = 7235998867680.

The previous prime is 7235998867663. The next prime is 7235998867733. The reversal of 7235998867681 is 1867688995327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7141636243456 + 94362624225 = 2672384^2 + 307185^2 .

It is a cyclic number.

It is not a de Polignac number, because 7235998867681 - 2¹³ = 7235998859489 is a prime.

It is a super-2 number, since 2×7235998867681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7235998867651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3617999433840 + 3617999433841.

It is an arithmetic number, because the mean of its divisors is an integer number (3617999433841).

Almost surely, 2^{7235998867681} is an apocalyptic number.

It is an amenable number.

7235998867681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7235998867681 is an equidigital number, since it uses as much as digits as its factorization.

7235998867681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2194698240, while the sum is 79.

The spelling of 7235998867681 in words is "seven trillion, two hundred thirty-five billion, nine hundred ninety-eight million, eight hundred sixty-seven thousand, six hundred eighty-one".