52639421609 has 2 divisors, whose sum is σ = 52639421610. Its totient is φ = 52639421608.

The previous prime is 52639421579. The next prime is 52639421621. The reversal of 52639421609 is 90612493625.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34392815209 + 18246606400 = 185453^2 + 135080^2 .

It is a cyclic number.

It is not a de Polignac number, because 52639421609 - 2⁸ = 52639421353 is a prime.

It is a super-2 number, since 2×52639421609² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (52639421669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26319710804 + 26319710805.

It is an arithmetic number, because the mean of its divisors is an integer number (26319710805).

Almost surely, 2^52639421609 is an apocalyptic number.

It is an amenable number.

52639421609 is a deficient number, since it is larger than the sum of its proper divisors (1).

52639421609 is an equidigital number, since it uses as much as digits as its factorization.

52639421609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 52639421609 in words is "fifty-two billion, six hundred thirty-nine million, four hundred twenty-one thousand, six hundred nine".