1665426007 has 16 divisors (see below), whose sum is σ = 1971604800. Its totient is φ = 1376444160.

The previous prime is 1665426001. The next prime is 1665426017. The reversal of 1665426007 is 7006245661.

It is a happy number.

It is not a de Polignac number, because 1665426007 - 2¹⁵ = 1665393239 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 (1665426001) 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, 159157 + ... + 169297.

It is an arithmetic number, because the mean of its divisors is an integer number (123225300).

Almost surely, 2^1665426007 is an apocalyptic number.

1665426007 is a deficient number, since it is larger than the sum of its proper divisors (306178793).

1665426007 is a wasteful number, since it uses less digits than its factorization.

1665426007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10986.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1665426007 is about 40809.6313019366. The cubic root of 1665426007 is about 1185.3368355304.

The spelling of 1665426007 in words is "one billion, six hundred sixty-five million, four hundred twenty-six thousand, seven".