1671856422912 has 768 divisors, whose sum is σ = 5578574077440. Its totient is φ = 496867737600.

The previous prime is 1671856422911. The next prime is 1671856422917. The reversal of 1671856422912 is 2192246581761.

1671856422912 is a `hidden beast` number, since 1 + 6 + 71 + 8 + 564 + 2 + 2 + 9 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671856422911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3208937212 + ... + 3208937732.

It is an arithmetic number, because the mean of its divisors is an integer number (7263768330).

Almost surely, 2^{1671856422912} is an apocalyptic number.

1671856422912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1671856422912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2789287038720).

1671856422912 is an abundant number, since it is smaller than the sum of its proper divisors (3906717654528).

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

1671856422912 is an frugal number, since it uses more digits than its factorization.

1671856422912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610 (or 570 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 1671856422912 in words is "one trillion, six hundred seventy-one billion, eight hundred fifty-six million, four hundred twenty-two thousand, nine hundred twelve".