666292541 has 2 divisors, whose sum is σ = 666292542. Its totient is φ = 666292540.

The previous prime is 666292507. The next prime is 666292553. The reversal of 666292541 is 145292666.

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., 552955225 + 113337316 = 23515^2 + 10646^2 .

It is a cyclic number.

It is not a de Polignac number, because 666292541 - 2¹⁰ = 666291517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666291541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333146270 + 333146271.

It is an arithmetic number, because the mean of its divisors is an integer number (333146271).

Almost surely, 2^666292541 is an apocalyptic number.

It is an amenable number.

666292541 is a deficient number, since it is larger than the sum of its proper divisors (1).

666292541 is an equidigital number, since it uses as much as digits as its factorization.

666292541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

The square root of 666292541 is about 25812.6430456085. The cubic root of 666292541 is about 873.4170197211.

The spelling of 666292541 in words is "six hundred sixty-six million, two hundred ninety-two thousand, five hundred forty-one".