19667600190397 has 2 divisors, whose sum is σ = 19667600190398. Its totient is φ = 19667600190396.

The previous prime is 19667600190373. The next prime is 19667600190409. The reversal of 19667600190397 is 79309100676691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18509449712121 + 1158150478276 = 4302261^2 + 1076174^2 .

It is a cyclic number.

It is not a de Polignac number, because 19667600190397 - 2⁷ = 19667600190269 is a prime.

It is a super-2 number, since 2×19667600190397² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19667600190367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9833800095198 + 9833800095199.

It is an arithmetic number, because the mean of its divisors is an integer number (9833800095199).

Almost surely, 2^{19667600190397} is an apocalyptic number.

It is an amenable number.

19667600190397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19667600190397 is an equidigital number, since it uses as much as digits as its factorization.

19667600190397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23147208, while the sum is 64.

The spelling of 19667600190397 in words is "nineteen trillion, six hundred sixty-seven billion, six hundred million, one hundred ninety thousand, three hundred ninety-seven".