5561151665 has 4 divisors (see below), whose sum is σ = 6673382004. Its totient is φ = 4448921328.

The previous prime is 5561151649. The next prime is 5561151671. The reversal of 5561151665 is 5661511655.

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 3200843776 + 2360307889 = 56576^2 + 48583^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561151665 - 2⁴ = 5561151649 is a prime.

It is a super-3 number, since 3×5561151665³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556115162 + ... + 556115171.

It is an arithmetic number, because the mean of its divisors is an integer number (1668345501).

Almost surely, 2^5561151665 is an apocalyptic number.

It is an amenable number.

5561151665 is a deficient number, since it is larger than the sum of its proper divisors (1112230339).

5561151665 is a wasteful number, since it uses less digits than its factorization.

5561151665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112230338.

The product of its digits is 135000, while the sum is 41.

The square root of 5561151665 is about 74573.1296446649. The cubic root of 5561151665 is about 1771.6920911094.

The spelling of 5561151665 in words is "five billion, five hundred sixty-one million, one hundred fifty-one thousand, six hundred sixty-five".