66523740 has 24 divisors (see below), whose sum is σ = 186266640. Its totient is φ = 17739648.

The previous prime is 66523729. The next prime is 66523741. The reversal of 66523740 is 4732566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66523741) 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, 554305 + ... + 554424.

It is an arithmetic number, because the mean of its divisors is an integer number (7761110).

Almost surely, 2^66523740 is an apocalyptic number.

66523740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66523740 is an abundant number, since it is smaller than the sum of its proper divisors (119742900).

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

66523740 is a wasteful number, since it uses less digits than its factorization.

66523740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108741 (or 1108739 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 66523740 is about 8156.2086780562. The cubic root of 66523740 is about 405.1901560931.

The spelling of 66523740 in words is "sixty-six million, five hundred twenty-three thousand, seven hundred forty".