1670681399 has 2 divisors, whose sum is σ = 1670681400. Its totient is φ = 1670681398.

The previous prime is 1670681339. The next prime is 1670681437. The reversal of 1670681399 is 9931860761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1670681399 - 2¹² = 1670677303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670681339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835340699 + 835340700.

It is an arithmetic number, because the mean of its divisors is an integer number (835340700).

Almost surely, 2^1670681399 is an apocalyptic number.

1670681399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670681399 is an equidigital number, since it uses as much as digits as its factorization.

1670681399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 1670681399 is about 40873.9696995533. The cubic root of 1670681399 is about 1186.5823364180.

The spelling of 1670681399 in words is "one billion, six hundred seventy million, six hundred eighty-one thousand, three hundred ninety-nine".