1666216513460 has 48 divisors (see below), whose sum is σ = 3573674125056. Its totient is φ = 652274739072.

The previous prime is 1666216513453. The next prime is 1666216513469. The reversal of 1666216513460 is 643156126661.

It is a super-2 number, since 2×1666216513460² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666216513469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34307354 + ... + 34355886.

It is an arithmetic number, because the mean of its divisors is an integer number (74451544272).

Almost surely, 2^{1666216513460} is an apocalyptic number.

1666216513460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666216513460 is an abundant number, since it is smaller than the sum of its proper divisors (1907457611596).

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

1666216513460 is a wasteful number, since it uses less digits than its factorization.

1666216513460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85112 (or 85110 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 1666216513460 in words is "one trillion, six hundred sixty-six billion, two hundred sixteen million, five hundred thirteen thousand, four hundred sixty".