145271881666 has 8 divisors (see below), whose sum is σ = 223222647564. Its totient is φ = 70864332480.

The previous prime is 145271881609. The next prime is 145271881673. The reversal of 145271881666 is 666188172541.

It can be written as a sum of positive squares in 2 ways, for example, as 145259314641 + 12567025 = 381129^2 + 3545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×145271881666³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885804075 + ... + 885804238.

Almost surely, 2^145271881666 is an apocalyptic number.

145271881666 is a deficient number, since it is larger than the sum of its proper divisors (77950765898).

145271881666 is a wasteful number, since it uses less digits than its factorization.

145271881666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771608356.

The product of its digits is 3870720, while the sum is 55.

The spelling of 145271881666 in words is "one hundred forty-five billion, two hundred seventy-one million, eight hundred eighty-one thousand, six hundred sixty-six".