66020457 has 16 divisors (see below), whose sum is σ = 90072000. Its totient is φ = 42998592.

The previous prime is 66020447. The next prime is 66020489. The reversal of 66020457 is 75402066.

It is not a de Polignac number, because 66020457 - 2⁷ = 66020329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66020407) 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, 43294 + ... + 44792.

It is an arithmetic number, because the mean of its divisors is an integer number (5629500).

Almost surely, 2^66020457 is an apocalyptic number.

It is an amenable number.

66020457 is a deficient number, since it is larger than the sum of its proper divisors (24051543).

66020457 is a wasteful number, since it uses less digits than its factorization.

66020457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 66020457 is about 8125.2973484052. The cubic root of 66020457 is about 404.1657511062.

The spelling of 66020457 in words is "sixty-six million, twenty thousand, four hundred fifty-seven".