66444534 has 48 divisors (see below), whose sum is σ = 164166912. Its totient is φ = 19240704.

The previous prime is 66444529. The next prime is 66444611. The reversal of 66444534 is 43544466.

66444534 = T₂₉₂ + T₂₉₃ + ... + T₇₅₀.

66444534 is a `hidden beast` number, since 6 + 644 + 4 + 5 + 3 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4374 + ... + 12329.

It is an arithmetic number, because the mean of its divisors is an integer number (3420144).

Almost surely, 2^66444534 is an apocalyptic number.

66444534 is an abundant number, since it is smaller than the sum of its proper divisors (97722378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66444534 is a wasteful number, since it uses less digits than its factorization.

66444534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16741 (or 16738 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 66444534 is about 8151.3516670550. The cubic root of 66444534 is about 405.0292800047.

The spelling of 66444534 in words is "sixty-six million, four hundred forty-four thousand, five hundred thirty-four".