66546613 has 12 divisors (see below), whose sum is σ = 79508128. Its totient is φ = 54556920.

The previous prime is 66546583. The next prime is 66546643. The reversal of 66546613 is 31664566.

It is an interprime number because it is at equal distance from previous prime (66546583) and next prime (66546643).

It is not a de Polignac number, because 66546613 - 2¹³ = 66538421 is a prime.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (66546643) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5283 + ... + 12688.

Almost surely, 2^66546613 is an apocalyptic number.

It is an amenable number.

66546613 is a deficient number, since it is larger than the sum of its proper divisors (12961515).

66546613 is a wasteful number, since it uses less digits than its factorization.

66546613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18024 (or 18001 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 66546613 is about 8157.6107408971. The cubic root of 66546613 is about 405.2365899048.

It can be divided in two parts, 665 and 46613, that added together give a triangular number (47278 = T₃₀₇).

The spelling of 66546613 in words is "sixty-six million, five hundred forty-six thousand, six hundred thirteen".