5261668781 has 16 divisors (see below), whose sum is σ = 5524070400. Its totient is φ = 5005484400.

The previous prime is 5261668777. The next prime is 5261668799. The reversal of 5261668781 is 1878661625.

It is a cyclic number.

It is not a de Polignac number, because 5261668781 - 2² = 5261668777 is a prime.

It is a super-2 number, since 2×5261668781² = 55370316721900051922, 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 (5261668771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786830 + ... + 793488.

It is an arithmetic number, because the mean of its divisors is an integer number (345254400).

Almost surely, 2^5261668781 is an apocalyptic number.

It is an amenable number.

5261668781 is a deficient number, since it is larger than the sum of its proper divisors (262401619).

5261668781 is a wasteful number, since it uses less digits than its factorization.

5261668781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7120.

The product of its digits is 967680, while the sum is 50.

The square root of 5261668781 is about 72537.3612767931. The cubic root of 5261668781 is about 1739.3000202240.

The spelling of 5261668781 in words is "five billion, two hundred sixty-one million, six hundred sixty-eight thousand, seven hundred eighty-one".