7766430641 has 4 divisors (see below), whose sum is σ = 7766662500. Its totient is φ = 7766198784.

The previous prime is 7766430611. The next prime is 7766430643. The reversal of 7766430641 is 1460346677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1460346677 = 73 ⋅20004749.

It can be written as a sum of positive squares in 2 ways, for example, as 2830665616 + 4935765025 = 53204^2 + 70255^2 .

It is a cyclic number.

It is not a de Polignac number, because 7766430641 - 2²² = 7762236337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7766430592 and 7766430601.

It is not an unprimeable number, because it can be changed into a prime (7766430643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55016 + ... + 136233.

It is an arithmetic number, because the mean of its divisors is an integer number (1941665625).

Almost surely, 2^7766430641 is an apocalyptic number.

It is an amenable number.

7766430641 is a deficient number, since it is larger than the sum of its proper divisors (231859).

7766430641 is a wasteful number, since it uses less digits than its factorization.

7766430641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231858.

The product of its (nonzero) digits is 508032, while the sum is 44.

The square root of 7766430641 is about 88127.3546692512. The cubic root of 7766430641 is about 1980.3433272787.

The spelling of 7766430641 in words is "seven billion, seven hundred sixty-six million, four hundred thirty thousand, six hundred forty-one".