652665421 has 2 divisors, whose sum is σ = 652665422. Its totient is φ = 652665420.

The previous prime is 652665401. The next prime is 652665427. The reversal of 652665421 is 124566256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450712900 + 201952521 = 21230^2 + 14211^2 .

It is a cyclic number.

It is not a de Polignac number, because 652665421 - 2⁵ = 652665389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (652665427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326332710 + 326332711.

It is an arithmetic number, because the mean of its divisors is an integer number (326332711).

Almost surely, 2^652665421 is an apocalyptic number.

It is an amenable number.

652665421 is a deficient number, since it is larger than the sum of its proper divisors (1).

652665421 is an equidigital number, since it uses as much as digits as its factorization.

652665421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 37.

The square root of 652665421 is about 25547.3172955596. The cubic root of 652665421 is about 867.4215376940.

The spelling of 652665421 in words is "six hundred fifty-two million, six hundred sixty-five thousand, four hundred twenty-one".