7661565945 has 24 divisors (see below), whose sum is σ = 14487325632. Its totient is φ = 3714698400.

The previous prime is 7661565859. The next prime is 7661566013. The reversal of 7661565945 is 5495651667.

7661565945 is a `hidden beast` number, since 76 + 6 + 1 + 565 + 9 + 4 + 5 = 666.

It is not a de Polignac number, because 7661565945 - 2⁹ = 7661565433 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7661565891 and 7661565900.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7738461 + ... + 7739450.

It is an arithmetic number, because the mean of its divisors is an integer number (603638568).

Almost surely, 2^7661565945 is an apocalyptic number.

It is an amenable number.

7661565945 is a deficient number, since it is larger than the sum of its proper divisors (6825759687).

7661565945 is a wasteful number, since it uses less digits than its factorization.

7661565945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15477933 (or 15477930 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 54.

The square root of 7661565945 is about 87530.3715575342. The cubic root of 7661565945 is about 1971.3898430933.

The spelling of 7661565945 in words is "seven billion, six hundred sixty-one million, five hundred sixty-five thousand, nine hundred forty-five".