366720173581 has 2 divisors, whose sum is σ = 366720173582. Its totient is φ = 366720173580.

The previous prime is 366720173569. The next prime is 366720173663. The reversal of 366720173581 is 185371027663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307326096900 + 59394076681 = 554370^2 + 243709^2 .

It is a cyclic number.

It is not a de Polignac number, because 366720173581 - 2⁵ = 366720173549 is a prime.

It is a super-2 number, since 2×366720173581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366720173551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 183360086790 + 183360086791.

It is an arithmetic number, because the mean of its divisors is an integer number (183360086791).

Almost surely, 2^366720173581 is an apocalyptic number.

It is an amenable number.

366720173581 is a deficient number, since it is larger than the sum of its proper divisors (1).

366720173581 is an equidigital number, since it uses as much as digits as its factorization.

366720173581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 366720173581 in words is "three hundred sixty-six billion, seven hundred twenty million, one hundred seventy-three thousand, five hundred eighty-one".