66444436 has 24 divisors (see below), whose sum is σ = 120911616. Its totient is φ = 31922880.

The previous prime is 66444431. The next prime is 66444437. The reversal of 66444436 is 63444466.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66444395 and 66444404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66444431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7965 + ... + 14011.

It is an arithmetic number, because the mean of its divisors is an integer number (5037984).

Almost surely, 2^66444436 is an apocalyptic number.

It is an amenable number.

66444436 is a deficient number, since it is larger than the sum of its proper divisors (54467180).

66444436 is a wasteful number, since it uses less digits than its factorization.

66444436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6159 (or 6157 counting only the distinct ones).

The product of its digits is 165888, while the sum is 37.

The square root of 66444436 is about 8151.3456557798. The cubic root of 66444436 is about 405.0290808768.

The spelling of 66444436 in words is "sixty-six million, four hundred forty-four thousand, four hundred thirty-six".