7770661 has 4 divisors (see below), whose sum is σ = 7843392. Its totient is φ = 7697932.

The previous prime is 7770643. The next prime is 7770667. The reversal of 7770661 is 1660777.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1660777 = 619 ⋅2683.

It is a cyclic number.

It is not a de Polignac number, because 7770661 - 2¹¹ = 7768613 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 (7770667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36205 + ... + 36418.

It is an arithmetic number, because the mean of its divisors is an integer number (1960848).

Almost surely, 2^7770661 is an apocalyptic number.

It is an amenable number.

7770661 is a deficient number, since it is larger than the sum of its proper divisors (72731).

7770661 is a wasteful number, since it uses less digits than its factorization.

7770661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72730.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 7770661 is about 2787.5905366463. The cubic root of 7770661 is about 198.0702825010.

The spelling of 7770661 in words is "seven million, seven hundred seventy thousand, six hundred sixty-one".