7765541961 has 16 divisors (see below), whose sum is σ = 10714714560. Its totient is φ = 4996819520.

The previous prime is 7765541899. The next prime is 7765541969. The reversal of 7765541961 is 1691455677.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7765541961 - 2⁶ = 7765541897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7765541969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275671 + ... + 302531.

It is an arithmetic number, because the mean of its divisors is an integer number (669669660).

Almost surely, 2^7765541961 is an apocalyptic number.

It is an amenable number.

7765541961 is a deficient number, since it is larger than the sum of its proper divisors (2949172599).

7765541961 is a wasteful number, since it uses less digits than its factorization.

7765541961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30216.

The product of its digits is 1587600, while the sum is 51.

The square root of 7765541961 is about 88122.3125037014. The cubic root of 7765541961 is about 1980.2677902777.

The spelling of 7765541961 in words is "seven billion, seven hundred sixty-five million, five hundred forty-one thousand, nine hundred sixty-one".