1667553397 has 2 divisors, whose sum is σ = 1667553398. Its totient is φ = 1667553396.

The previous prime is 1667553361. The next prime is 1667553413. The reversal of 1667553397 is 7933557661.

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., 1248491556 + 419061841 = 35334^2 + 20471^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667553397 - 2⁷ = 1667553269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1667553347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833776698 + 833776699.

It is an arithmetic number, because the mean of its divisors is an integer number (833776699).

Almost surely, 2^1667553397 is an apocalyptic number.

It is an amenable number.

1667553397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667553397 is an equidigital number, since it uses as much as digits as its factorization.

1667553397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3572100, while the sum is 52.

The square root of 1667553397 is about 40835.6877865428. The cubic root of 1667553397 is about 1185.8413312300.

The spelling of 1667553397 in words is "one billion, six hundred sixty-seven million, five hundred fifty-three thousand, three hundred ninety-seven".