66653920 has 48 divisors (see below), whose sum is σ = 157958640. Its totient is φ = 26578944.

The previous prime is 66653911. The next prime is 66653921. The reversal of 66653920 is 2935666.

It is a self number, because there is not a number n which added to its sum of digits gives 66653920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66653921) 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, 98704 + ... + 99376.

It is an arithmetic number, because the mean of its divisors is an integer number (3290805).

Almost surely, 2^66653920 is an apocalyptic number.

It is an amenable number.

66653920 is an abundant number, since it is smaller than the sum of its proper divisors (91304720).

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

66653920 is a wasteful number, since it uses less digits than its factorization.

66653920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1299 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 66653920 is about 8164.1852012310. The cubic root of 66653920 is about 405.4542887905.

It can be divided in two parts, 6665 and 3920, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 66653920 in words is "sixty-six million, six hundred fifty-three thousand, nine hundred twenty".