1065156661 has 2 divisors, whose sum is σ = 1065156662. Its totient is φ = 1065156660.

The previous prime is 1065156643. The next prime is 1065156667. The reversal of 1065156661 is 1666515601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 773396100 + 291760561 = 27810^2 + 17081^2 .

It is an emirp because it is prime and its reverse (1666515601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1065156661 - 2⁹ = 1065156149 is a prime.

It is a super-2 number, since 2×1065156661² = 2269117424945337842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1065156661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1065156667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532578330 + 532578331.

It is an arithmetic number, because the mean of its divisors is an integer number (532578331).

Almost surely, 2^1065156661 is an apocalyptic number.

It is an amenable number.

1065156661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1065156661 is an equidigital number, since it uses as much as digits as its factorization.

1065156661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1065156661 is about 32636.7379037795. The cubic root of 1065156661 is about 1021.2635440086.

The spelling of 1065156661 in words is "one billion, sixty-five million, one hundred fifty-six thousand, six hundred sixty-one".