5478723721 has 2 divisors, whose sum is σ = 5478723722. Its totient is φ = 5478723720.

The previous prime is 5478723661. The next prime is 5478723727. The reversal of 5478723721 is 1273278745.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5006270025 + 472453696 = 70755^2 + 21736^2 .

It is a cyclic number.

It is not a de Polignac number, because 5478723721 - 2²⁷ = 5344505993 is a prime.

It is a super-2 number, since 2×5478723721² = 60032827222096171682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5478723727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2739361860 + 2739361861.

It is an arithmetic number, because the mean of its divisors is an integer number (2739361861).

Almost surely, 2^5478723721 is an apocalyptic number.

It is an amenable number.

5478723721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5478723721 is an equidigital number, since it uses as much as digits as its factorization.

5478723721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 46.

The square root of 5478723721 is about 74018.4012323963. The cubic root of 5478723721 is about 1762.8950846178.

The spelling of 5478723721 in words is "five billion, four hundred seventy-eight million, seven hundred twenty-three thousand, seven hundred twenty-one".