1061515110661 has 4 divisors (see below), whose sum is σ = 1123957176012. Its totient is φ = 999073045312.

The previous prime is 1061515110641. The next prime is 1061515110673. The reversal of 1061515110661 is 1660115151601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 663726313636 + 397788797025 = 814694^2 + 630705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061515110661 - 2¹¹ = 1061515108613 is a prime.

It is a super-2 number, since 2×1061515110661² (a number of 25 digits) 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 (1061515110641) 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, 31221032650 + ... + 31221032683.

It is an arithmetic number, because the mean of its divisors is an integer number (280989294003).

Almost surely, 2^{1061515110661} is an apocalyptic number.

It is an amenable number.

1061515110661 is a deficient number, since it is larger than the sum of its proper divisors (62442065351).

1061515110661 is an equidigital number, since it uses as much as digits as its factorization.

1061515110661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62442065350.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 1061515110661 in words is "one trillion, sixty-one billion, five hundred fifteen million, one hundred ten thousand, six hundred sixty-one".