7661361945 has 16 divisors (see below), whose sum is σ = 12260181312. Its totient is φ = 4085392320.

The previous prime is 7661361937. The next prime is 7661361971. The reversal of 7661361945 is 5491631667.

It is not a de Polignac number, because 7661361945 - 2³ = 7661361937 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7661361894 and 7661361903.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61410 + ... + 138180.

It is an arithmetic number, because the mean of its divisors is an integer number (766261332).

Almost surely, 2^7661361945 is an apocalyptic number.

It is an amenable number.

7661361945 is a deficient number, since it is larger than the sum of its proper divisors (4598819367).

7661361945 is a wasteful number, since it uses less digits than its factorization.

7661361945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83432.

The product of its digits is 816480, while the sum is 48.

The square root of 7661361945 is about 87529.2062399746. The cubic root of 7661361945 is about 1971.3723459262.

The spelling of 7661361945 in words is "seven billion, six hundred sixty-one million, three hundred sixty-one thousand, nine hundred forty-five".