66048857 has 4 divisors (see below), whose sum is σ = 75484416. Its totient is φ = 56613300.

The previous prime is 66048841. The next prime is 66048881. The reversal of 66048857 is 75884066.

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 a cyclic number.

It is not a de Polignac number, because 66048857 - 2⁴ = 66048841 is a prime.

It is a super-2 number, since 2×66048857² = 8724903022012898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66048887) 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, 4717769 + ... + 4717782.

It is an arithmetic number, because the mean of its divisors is an integer number (18871104).

Almost surely, 2^66048857 is an apocalyptic number.

It is an amenable number.

66048857 is a deficient number, since it is larger than the sum of its proper divisors (9435559).

66048857 is an equidigital number, since it uses as much as digits as its factorization.

66048857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9435558.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66048857 is about 8127.0447888516. The cubic root of 66048857 is about 404.2236960845.

The spelling of 66048857 in words is "sixty-six million, forty-eight thousand, eight hundred fifty-seven".