7666505 has 16 divisors (see below), whose sum is σ = 11470464. Its totient is φ = 4778880.

The previous prime is 7666501. The next prime is 7666531. The reversal of 7666505 is 5056667.

It is not a de Polignac number, because 7666505 - 2² = 7666501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7666501) 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, 9572 + ... + 10341.

It is an arithmetic number, because the mean of its divisors is an integer number (716904).

Almost surely, 2^7666505 is an apocalyptic number.

It is an amenable number.

7666505 is a deficient number, since it is larger than the sum of its proper divisors (3803959).

7666505 is a wasteful number, since it uses less digits than its factorization.

7666505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19936.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 7666505 is about 2768.8454272494. The cubic root of 7666505 is about 197.1813373191.

The spelling of 7666505 in words is "seven million, six hundred sixty-six thousand, five hundred five".