5661005012 has 12 divisors (see below), whose sum is σ = 10668817236. Its totient is φ = 2612771520.

The previous prime is 5661005011. The next prime is 5661005029. The reversal of 5661005012 is 2105001665.

It can be written as a sum of positive squares in 2 ways, for example, as 2031665476 + 3629339536 = 45074^2 + 60244^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661005011) 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, 54432689 + ... + 54432792.

It is an arithmetic number, because the mean of its divisors is an integer number (889068103).

Almost surely, 2^5661005012 is an apocalyptic number.

5661005012 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

5661005012 is a deficient number, since it is larger than the sum of its proper divisors (5007812224).

5661005012 is a wasteful number, since it uses less digits than its factorization.

5661005012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108865498 (or 108865496 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 5661005012 is about 75239.6505308205. The cubic root of 5661005012 is about 1782.2331324875.

Adding to 5661005012 its reverse (2105001665), we get a palindrome (7766006677).

The spelling of 5661005012 in words is "five billion, six hundred sixty-one million, five thousand, twelve".