1666167621360 has 160 divisors (see below), whose sum is σ = 5966127643392. Its totient is φ = 380159447040.

The previous prime is 1666167621359. The next prime is 1666167621367. The reversal of 1666167621360 is 631267616661.

It is a super-2 number, since 2×1666167621360² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666167621367) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18517594 + ... + 18607353.

Almost surely, 2^{1666167621360} is an apocalyptic number.

1666167621360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666167621360 is an abundant number, since it is smaller than the sum of its proper divisors (4299960022032).

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

1666167621360 is a wasteful number, since it uses less digits than its factorization.

1666167621360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37124991 (or 37124985 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 1666167621360 in words is "one trillion, six hundred sixty-six billion, one hundred sixty-seven million, six hundred twenty-one thousand, three hundred sixty".