66528461 has 2 divisors, whose sum is σ = 66528462. Its totient is φ = 66528460.

The previous prime is 66528431. The next prime is 66528467. The reversal of 66528461 is 16482566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 28026436 = 6205^2 + 5294^2 .

It is a cyclic number.

It is not a de Polignac number, because 66528461 - 2¹⁰ = 66527437 is a prime.

It is a super-2 number, since 2×66528461² = 8852072246057042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66528467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33264230 + 33264231.

It is an arithmetic number, because the mean of its divisors is an integer number (33264231).

Almost surely, 2^66528461 is an apocalyptic number.

It is an amenable number.

66528461 is a deficient number, since it is larger than the sum of its proper divisors (1).

66528461 is an equidigital number, since it uses as much as digits as its factorization.

66528461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 66528461 is about 8156.4980843497. The cubic root of 66528461 is about 405.1997409294.

The spelling of 66528461 in words is "sixty-six million, five hundred twenty-eight thousand, four hundred sixty-one".