1661425534080 has 1024 divisors, whose sum is σ = 6449647680000. Its totient is φ = 404153597952.

The previous prime is 1661425534061. The next prime is 1661425534091. The reversal of 1661425534080 is 804355241661.

1661425534080 is a `hidden beast` number, since 1 + 6 + 6 + 14 + 2 + 553 + 4 + 0 + 80 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4062164916 + ... + 4062165324.

Almost surely, 2^{1661425534080} is an apocalyptic number.

1661425534080 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 1661425534080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3224823840000).

1661425534080 is an abundant number, since it is smaller than the sum of its proper divisors (4788222145920).

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

1661425534080 is a wasteful number, since it uses less digits than its factorization.

1661425534080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 1661425534080 in words is "one trillion, six hundred sixty-one billion, four hundred twenty-five million, five hundred thirty-four thousand, eighty".