665122151 has 16 divisors (see below), whose sum is σ = 719241600. Its totient is φ = 613031328.

The previous prime is 665122141. The next prime is 665122169. The reversal of 665122151 is 151221566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 665122151 - 2¹⁴ = 665105767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665122111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224840 + ... + 227778.

It is an arithmetic number, because the mean of its divisors is an integer number (44952600).

Almost surely, 2^665122151 is an apocalyptic number.

665122151 is a deficient number, since it is larger than the sum of its proper divisors (54119449).

665122151 is a wasteful number, since it uses less digits than its factorization.

665122151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278.

The product of its digits is 3600, while the sum is 29.

The square root of 665122151 is about 25789.9622140088. The cubic root of 665122151 is about 872.9053137200.

The spelling of 665122151 in words is "six hundred sixty-five million, one hundred twenty-two thousand, one hundred fifty-one".