52947378521 has 2 divisors, whose sum is σ = 52947378522. Its totient is φ = 52947378520.

The previous prime is 52947378487. The next prime is 52947378581. The reversal of 52947378521 is 12587374925.

52947378521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51342574921 + 1604803600 = 226589^2 + 40060^2 .

It is a cyclic number.

It is not a de Polignac number, because 52947378521 - 2⁶ = 52947378457 is a prime.

It is not a weakly prime, because it can be changed into another prime (52947378581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26473689260 + 26473689261.

It is an arithmetic number, because the mean of its divisors is an integer number (26473689261).

Almost surely, 2^52947378521 is an apocalyptic number.

It is an amenable number.

52947378521 is a deficient number, since it is larger than the sum of its proper divisors (1).

52947378521 is an equidigital number, since it uses as much as digits as its factorization.

52947378521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 53.

The spelling of 52947378521 in words is "fifty-two billion, nine hundred forty-seven million, three hundred seventy-eight thousand, five hundred twenty-one".