7665601 has 4 divisors (see below), whose sum is σ = 7998912. Its totient is φ = 7332292.

The previous prime is 7665583. The next prime is 7665613. The reversal of 7665601 is 1065667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7665601 is a prime.

It is a super-2 number, since 2×7665601² = 117522877382402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

7665601 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7665641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166621 + ... + 166666.

It is an arithmetic number, because the mean of its divisors is an integer number (1999728).

Almost surely, 2^7665601 is an apocalyptic number.

It is an amenable number.

7665601 is a deficient number, since it is larger than the sum of its proper divisors (333311).

7665601 is a wasteful number, since it uses less digits than its factorization.

7665601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333310.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 7665601 is about 2768.6821774989. The cubic root of 7665601 is about 197.1735867672.

Subtracting from 7665601 its sum of digits (31), we obtain a triangular number (7665570 = T₃₉₁₅).

The spelling of 7665601 in words is "seven million, six hundred sixty-five thousand, six hundred one".