66297749 has 4 divisors (see below), whose sum is σ = 75768864. Its totient is φ = 56826636.

The previous prime is 66297743. The next prime is 66297757. The reversal of 66297749 is 94779266.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94779266 = 2 ⋅47389633.

It is a cyclic number.

It is not a de Polignac number, because 66297749 - 2⁴ = 66297733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66297697 and 66297706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66297743) 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, 4735547 + ... + 4735560.

It is an arithmetic number, because the mean of its divisors is an integer number (18942216).

Almost surely, 2^66297749 is an apocalyptic number.

It is an amenable number.

66297749 is a deficient number, since it is larger than the sum of its proper divisors (9471115).

66297749 is an equidigital number, since it uses as much as digits as its factorization.

66297749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471114.

The product of its digits is 1143072, while the sum is 50.

The square root of 66297749 is about 8142.3429674756. The cubic root of 66297749 is about 404.7308052096.

The spelling of 66297749 in words is "sixty-six million, two hundred ninety-seven thousand, seven hundred forty-nine".