166707551 has 2 divisors, whose sum is σ = 166707552. Its totient is φ = 166707550.

The previous prime is 166707493. The next prime is 166707557. The reversal of 166707551 is 155707661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166707551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166707557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83353775 + 83353776.

It is an arithmetic number, because the mean of its divisors is an integer number (83353776).

Almost surely, 2^166707551 is an apocalyptic number.

166707551 is a deficient number, since it is larger than the sum of its proper divisors (1).

166707551 is an equidigital number, since it uses as much as digits as its factorization.

166707551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 166707551 is about 12911.5278336841. The cubic root of 166707551 is about 550.3662035015.

The spelling of 166707551 in words is "one hundred sixty-six million, seven hundred seven thousand, five hundred fifty-one".