73443756109 has 2 divisors, whose sum is σ = 73443756110. Its totient is φ = 73443756108.

The previous prime is 73443756047. The next prime is 73443756119. The reversal of 73443756109 is 90165734437.

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., 63228611209 + 10215144900 = 251453^2 + 101070^2 .

It is a cyclic number.

It is not a de Polignac number, because 73443756109 - 2⁷ = 73443755981 is a prime.

It is a super-2 number, since 2×73443756109² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73443756119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36721878054 + 36721878055.

It is an arithmetic number, because the mean of its divisors is an integer number (36721878055).

Almost surely, 2^73443756109 is an apocalyptic number.

It is an amenable number.

73443756109 is a deficient number, since it is larger than the sum of its proper divisors (1).

73443756109 is an equidigital number, since it uses as much as digits as its factorization.

73443756109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 73443756109 in words is "seventy-three billion, four hundred forty-three million, seven hundred fifty-six thousand, one hundred nine".