66469857 has 4 divisors (see below), whose sum is σ = 88626480. Its totient is φ = 44313236.

The previous prime is 66469849. The next prime is 66469861. The reversal of 66469857 is 75896466.

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 66469857 - 2³ = 66469849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66469157) 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, 11078307 + ... + 11078312.

It is an arithmetic number, because the mean of its divisors is an integer number (22156620).

Almost surely, 2^66469857 is an apocalyptic number.

It is an amenable number.

66469857 is a deficient number, since it is larger than the sum of its proper divisors (22156623).

66469857 is a wasteful number, since it uses less digits than its factorization.

66469857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22156622.

The product of its digits is 2177280, while the sum is 51.

The square root of 66469857 is about 8152.9048197560. The cubic root of 66469857 is about 405.0807276967.

The spelling of 66469857 in words is "sixty-six million, four hundred sixty-nine thousand, eight hundred fifty-seven".