7667767661 has 4 divisors (see below), whose sum is σ = 8071334400. Its totient is φ = 7264200924.

The previous prime is 7667767651. The next prime is 7667767673. The reversal of 7667767661 is 1667677667.

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-7667767661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7667767661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7667767651) 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, 201783341 + ... + 201783378.

It is an arithmetic number, because the mean of its divisors is an integer number (2017833600).

Almost surely, 2^7667767661 is an apocalyptic number.

It is an amenable number.

7667767661 is a deficient number, since it is larger than the sum of its proper divisors (403566739).

7667767661 is a wasteful number, since it uses less digits than its factorization.

7667767661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403566738.

The product of its digits is 18670176, while the sum is 59.

The square root of 7667767661 is about 87565.7904720788. The cubic root of 7667767661 is about 1971.9216187421.

The spelling of 7667767661 in words is "seven billion, six hundred sixty-seven million, seven hundred sixty-seven thousand, six hundred sixty-one".