1666259672 has 64 divisors (see below), whose sum is σ = 4020848640. Its totient is φ = 628243200.

The previous prime is 1666259671. The next prime is 1666259681. The reversal of 1666259672 is 2769526661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666259672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666259671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24533 + ... + 62724.

It is an arithmetic number, because the mean of its divisors is an integer number (62825760).

Almost surely, 2^1666259672 is an apocalyptic number.

It is an amenable number.

1666259672 is an abundant number, since it is smaller than the sum of its proper divisors (2354588968).

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

1666259672 is a wasteful number, since it uses less digits than its factorization.

1666259672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87312 (or 87308 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 50.

The square root of 1666259672 is about 40819.8440957336. The cubic root of 1666259672 is about 1185.5345845329.

The spelling of 1666259672 in words is "one billion, six hundred sixty-six million, two hundred fifty-nine thousand, six hundred seventy-two".