1667019997 has 2 divisors, whose sum is σ = 1667019998. Its totient is φ = 1667019996.

The previous prime is 1667019989. The next prime is 1667020027. The reversal of 1667019997 is 7999107661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1014677316 + 652342681 = 31854^2 + 25541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667019997 - 2³ = 1667019989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1667019097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833509998 + 833509999.

It is an arithmetic number, because the mean of its divisors is an integer number (833509999).

Almost surely, 2^1667019997 is an apocalyptic number.

It is an amenable number.

1667019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667019997 is an equidigital number, since it uses as much as digits as its factorization.

1667019997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1285956, while the sum is 55.

The square root of 1667019997 is about 40829.1562121972. The cubic root of 1667019997 is about 1185.7148794632.

The spelling of 1667019997 in words is "one billion, six hundred sixty-seven million, nineteen thousand, nine hundred ninety-seven".