1620278745000 has 160 divisors (see below), whose sum is σ = 5068526052480. Its totient is φ = 431496000000.

The previous prime is 1620278744999. The next prime is 1620278745061. The reversal of 1620278745000 is 5478720261.

It is a super-2 number, since 2×1620278745000² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11193084 + ... + 11336916.

It is an arithmetic number, because the mean of its divisors is an integer number (31678287828).

Almost surely, 2^{1620278745000} is an apocalyptic number.

1620278745000 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 1620278745000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2534263026240).

1620278745000 is an abundant number, since it is smaller than the sum of its proper divisors (3448247307480).

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

1620278745000 is a wasteful number, since it uses less digits than its factorization.

1620278745000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144613 (or 144594 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 1620278745000 in words is "one trillion, six hundred twenty billion, two hundred seventy-eight million, seven hundred forty-five thousand".