66057497 has 16 divisors (see below), whose sum is σ = 74747904. Its totient is φ = 57834000.

The previous prime is 66057479. The next prime is 66057499. The reversal of 66057497 is 79475066.

It is a cyclic number.

It is not a de Polignac number, because 66057497 - 2⁸ = 66057241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66057499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104372 + ... + 105002.

It is an arithmetic number, because the mean of its divisors is an integer number (4671744).

Almost surely, 2^66057497 is an apocalyptic number.

It is an amenable number.

66057497 is a deficient number, since it is larger than the sum of its proper divisors (8690407).

66057497 is a wasteful number, since it uses less digits than its factorization.

66057497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 66057497 is about 8127.5763300015. The cubic root of 66057497 is about 404.2413211206.

Subtracting 66057497 from its reverse (79475066), we obtain a square (13417569 = 3663²).

The spelling of 66057497 in words is "sixty-six million, fifty-seven thousand, four hundred ninety-seven".