17790357997 has 2 divisors, whose sum is σ = 17790357998. Its totient is φ = 17790357996.

The previous prime is 17790357979. The next prime is 17790358013. The reversal of 17790357997 is 79975309771.

Together with previous prime (17790357979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9449006436 + 8341351561 = 97206^2 + 91331^2 .

It is a cyclic number.

It is not a de Polignac number, because 17790357997 - 2⁷ = 17790357869 is a prime.

It is a super-2 number, since 2×17790357997² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17790357917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8895178998 + 8895178999.

It is an arithmetic number, because the mean of its divisors is an integer number (8895178999).

Almost surely, 2^17790357997 is an apocalyptic number.

It is an amenable number.

17790357997 is a deficient number, since it is larger than the sum of its proper divisors (1).

17790357997 is an equidigital number, since it uses as much as digits as its factorization.

17790357997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26254935, while the sum is 64.

The spelling of 17790357997 in words is "seventeen billion, seven hundred ninety million, three hundred fifty-seven thousand, nine hundred ninety-seven".