66523025 has 12 divisors (see below), whose sum is σ = 82886064. Its totient is φ = 52962000.

The previous prime is 66522997. The next prime is 66523043. The reversal of 66523025 is 52032566.

It is a happy number.

It is not a de Polignac number, because 66523025 - 2¹⁴ = 66506641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1031 + ... + 11580.

It is an arithmetic number, because the mean of its divisors is an integer number (6907172).

Almost surely, 2^66523025 is an apocalyptic number.

It is an amenable number.

66523025 is a deficient number, since it is larger than the sum of its proper divisors (16363039).

66523025 is a wasteful number, since it uses less digits than its factorization.

66523025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12832 (or 12827 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 66523025 is about 8156.1648462988. The cubic root of 66523025 is about 405.1887044209.

The spelling of 66523025 in words is "sixty-six million, five hundred twenty-three thousand, twenty-five".