7165561081 has 24 divisors (see below), whose sum is σ = 8934476096. Its totient is φ = 5624328960.

The previous prime is 7165561079. The next prime is 7165561093. The reversal of 7165561081 is 1801655617.

It is not a de Polignac number, because 7165561081 - 2¹ = 7165561079 is a prime.

It is a super-2 number, since 2×7165561081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7165561001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26986 + ... + 122716.

Almost surely, 2^7165561081 is an apocalyptic number.

It is an amenable number.

7165561081 is a deficient number, since it is larger than the sum of its proper divisors (1768915015).

7165561081 is a wasteful number, since it uses less digits than its factorization.

7165561081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95809 (or 95792 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 7165561081 is about 84649.6372171789. The cubic root of 7165561081 is about 1927.8951056643.

The spelling of 7165561081 in words is "seven billion, one hundred sixty-five million, five hundred sixty-one thousand, eighty-one".