1015165661 has 4 divisors (see below), whose sum is σ = 1015236924. Its totient is φ = 1015094400.

The previous prime is 1015165637. The next prime is 1015165663. The reversal of 1015165661 is 1665615101.

1015165661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1665615101 = 5119 ⋅325379.

It can be written as a sum of positive squares in 2 ways, for example, as 477204025 + 537961636 = 21845^2 + 23194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1015165661 - 2¹⁴ = 1015149277 is a prime.

It is a super-2 number, since 2×1015165661² = 2061122638547133842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1015165663) 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, 6110 + ... + 45471.

It is an arithmetic number, because the mean of its divisors is an integer number (253809231).

Almost surely, 2^1015165661 is an apocalyptic number.

It is an amenable number.

1015165661 is a deficient number, since it is larger than the sum of its proper divisors (71263).

1015165661 is an equidigital number, since it uses as much as digits as its factorization.

1015165661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71262.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1015165661 is about 31861.6644417708. The cubic root of 1015165661 is about 1005.0298782401.

The spelling of 1015165661 in words is "one billion, fifteen million, one hundred sixty-five thousand, six hundred sixty-one".