66056457 has 4 divisors (see below), whose sum is σ = 88075280. Its totient is φ = 44037636.

The previous prime is 66056429. The next prime is 66056489. The reversal of 66056457 is 75465066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66056457 - 2¹⁰ = 66055433 is a prime.

It is a super-2 number, since 2×66056457² = 8726911022785698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66046457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11009407 + ... + 11009412.

It is an arithmetic number, because the mean of its divisors is an integer number (22018820).

Almost surely, 2^66056457 is an apocalyptic number.

It is an amenable number.

66056457 is a deficient number, since it is larger than the sum of its proper divisors (22018823).

66056457 is a wasteful number, since it uses less digits than its factorization.

66056457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22018822.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 66056457 is about 8127.5123500368. The cubic root of 66056457 is about 404.2391996698.

The spelling of 66056457 in words is "sixty-six million, fifty-six thousand, four hundred fifty-seven".