1065501561 has 4 divisors (see below), whose sum is σ = 1420668752. Its totient is φ = 710334372.

The previous prime is 1065501553. The next prime is 1065501599. The reversal of 1065501561 is 1651055601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1065501561 - 2³ = 1065501553 is a prime.

It is a super-2 number, since 2×1065501561² = 2270587152986873442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1065501161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177583591 + ... + 177583596.

It is an arithmetic number, because the mean of its divisors is an integer number (355167188).

Almost surely, 2^1065501561 is an apocalyptic number.

It is an amenable number.

1065501561 is a deficient number, since it is larger than the sum of its proper divisors (355167191).

1065501561 is an equidigital number, since it uses as much as digits as its factorization.

1065501561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355167190.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1065501561 is about 32642.0213988043. The cubic root of 1065501561 is about 1021.3737612183.

The spelling of 1065501561 in words is "one billion, sixty-five million, five hundred one thousand, five hundred sixty-one".