653703666 has 32 divisors (see below), whose sum is σ = 1630015488. Its totient is φ = 169793040.

The previous prime is 653703653. The next prime is 653703667. The reversal of 653703666 is 666307356.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (653703667) 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 15 ways as a sum of consecutive naturals, for example, 707010 + ... + 707933.

It is an arithmetic number, because the mean of its divisors is an integer number (50937984).

Almost surely, 2^653703666 is an apocalyptic number.

653703666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

653703666 is an abundant number, since it is smaller than the sum of its proper divisors (976311822).

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

653703666 is a wasteful number, since it uses less digits than its factorization.

653703666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414966.

The product of its (nonzero) digits is 408240, while the sum is 42.

The square root of 653703666 is about 25567.6292604535. The cubic root of 653703666 is about 867.8812520274.

The spelling of 653703666 in words is "six hundred fifty-three million, seven hundred three thousand, six hundred sixty-six".