1551998945280 has 768 divisors, whose sum is σ = 5885553623040. Its totient is φ = 341741666304.

The previous prime is 1551998945267. The next prime is 1551998945303. The reversal of 1551998945280 is 825498991551.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 851342449 + ... + 851344271.

It is an arithmetic number, because the mean of its divisors is an integer number (7663481280).

Almost surely, 2^{1551998945280} is an apocalyptic number.

1551998945280 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 1551998945280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2942776811520).

1551998945280 is an abundant number, since it is smaller than the sum of its proper divisors (4333554677760).

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

1551998945280 is a wasteful number, since it uses less digits than its factorization.

1551998945280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004 (or 1984 counting only the distinct ones).

The product of its (nonzero) digits is 46656000, while the sum is 66.

The spelling of 1551998945280 in words is "one trillion, five hundred fifty-one billion, nine hundred ninety-eight million, nine hundred forty-five thousand, two hundred eighty".