667671541 has 2 divisors, whose sum is σ = 667671542. Its totient is φ = 667671540.

The previous prime is 667671523. The next prime is 667671559. The reversal of 667671541 is 145176766.

It is a balanced prime because it is at equal distance from previous prime (667671523) and next prime (667671559).

It can be written as a sum of positive squares in only one way, i.e., 601720900 + 65950641 = 24530^2 + 8121^2 .

It is a cyclic number.

It is not a de Polignac number, because 667671541 - 2¹⁷ = 667540469 is a prime.

It is a super-2 number, since 2×667671541² = 891570573322629362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667671041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333835770 + 333835771.

It is an arithmetic number, because the mean of its divisors is an integer number (333835771).

Almost surely, 2^667671541 is an apocalyptic number.

It is an amenable number.

667671541 is a deficient number, since it is larger than the sum of its proper divisors (1).

667671541 is an equidigital number, since it uses as much as digits as its factorization.

667671541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 667671541 is about 25839.3409552179. The cubic root of 667671541 is about 874.0191636850.

The spelling of 667671541 in words is "six hundred sixty-seven million, six hundred seventy-one thousand, five hundred forty-one".