2019977799840 has 2592 divisors, whose sum is σ = 9912140574336. Its totient is φ = 363679580160.

The previous prime is 2019977799751. The next prime is 2019977799869. The reversal of 2019977799840 is 489977799102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 5415489894 + ... + 5415490266.

It is an arithmetic number, because the mean of its divisors is an integer number (3824128308).

Almost surely, 2^{2019977799840} is an apocalyptic number.

2019977799840 is a gapful number since it is divisible by the number (20) 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 2019977799840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4956070287168).

2019977799840 is an abundant number, since it is smaller than the sum of its proper divisors (7892162774496).

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

2019977799840 is a wasteful number, since it uses less digits than its factorization.

2019977799840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 144027072, while the sum is 72.

The spelling of 2019977799840 in words is "two trillion, nineteen billion, nine hundred seventy-seven million, seven hundred ninety-nine thousand, eight hundred forty".