52647043621 has 2 divisors, whose sum is σ = 52647043622. Its totient is φ = 52647043620.

The previous prime is 52647043609. The next prime is 52647043637. The reversal of 52647043621 is 12634074625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52207680100 + 439363521 = 228490^2 + 20961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52647043621 is a prime.

It is a super-2 number, since 2×52647043621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52647043651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26323521810 + 26323521811.

It is an arithmetic number, because the mean of its divisors is an integer number (26323521811).

Almost surely, 2^52647043621 is an apocalyptic number.

It is an amenable number.

52647043621 is a deficient number, since it is larger than the sum of its proper divisors (1).

52647043621 is an equidigital number, since it uses as much as digits as its factorization.

52647043621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 52647043621 in words is "fifty-two billion, six hundred forty-seven million, forty-three thousand, six hundred twenty-one".