180993639457 has 2 divisors, whose sum is σ = 180993639458. Its totient is φ = 180993639456.

The previous prime is 180993639397. The next prime is 180993639461. The reversal of 180993639457 is 754936399081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144879958161 + 36113681296 = 380631^2 + 190036^2 .

It is a cyclic number.

It is not a de Polignac number, because 180993639457 - 2¹⁹ = 180993115169 is a prime.

It is not a weakly prime, because it can be changed into another prime (180993639467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90496819728 + 90496819729.

It is an arithmetic number, because the mean of its divisors is an integer number (90496819729).

Almost surely, 2^180993639457 is an apocalyptic number.

It is an amenable number.

180993639457 is a deficient number, since it is larger than the sum of its proper divisors (1).

180993639457 is an equidigital number, since it uses as much as digits as its factorization.

180993639457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44089920, while the sum is 64.

The spelling of 180993639457 in words is "one hundred eighty billion, nine hundred ninety-three million, six hundred thirty-nine thousand, four hundred fifty-seven".