66472749 has 24 divisors (see below), whose sum is σ = 110116032. Its totient is φ = 37851840.

The previous prime is 66472741. The next prime is 66472751. The reversal of 66472749 is 94727466.

It is not a de Polignac number, because 66472749 - 2³ = 66472741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66472741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18034 + ... + 21404.

It is an arithmetic number, because the mean of its divisors is an integer number (4588168).

Almost surely, 2^66472749 is an apocalyptic number.

It is an amenable number.

66472749 is a deficient number, since it is larger than the sum of its proper divisors (43643283).

66472749 is a wasteful number, since it uses less digits than its factorization.

66472749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3697 (or 3694 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 66472749 is about 8153.0821779251. The cubic root of 66472749 is about 405.0866024221.

The spelling of 66472749 in words is "sixty-six million, four hundred seventy-two thousand, seven hundred forty-nine".