1671401571840 has 5120 divisors, whose sum is σ = 8909429760000. Its totient is φ = 291325870080.

The previous prime is 1671401571821. The next prime is 1671401571863. The reversal of 1671401571840 is 481751041761.

1671401571840 is a `hidden beast` number, since 1 + 6 + 71 + 4 + 0 + 1 + 571 + 8 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 57634536946 + ... + 57634536974.

It is an arithmetic number, because the mean of its divisors is an integer number (1740123000).

Almost surely, 2^{1671401571840} is an apocalyptic number.

1671401571840 is a gapful number since it is divisible by the number (10) 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 1671401571840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4454714880000).

1671401571840 is an abundant number, since it is smaller than the sum of its proper divisors (7238028188160).

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

1671401571840 is a wasteful number, since it uses less digits than its factorization.

1671401571840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 1671401571840 in words is "one trillion, six hundred seventy-one billion, four hundred one million, five hundred seventy-one thousand, eight hundred forty".