2011206778380 has 192 divisors, whose sum is σ = 6404180428800. Its totient is φ = 523720028160.

The previous prime is 2011206778319. The next prime is 2011206778381. The reversal of 2011206778380 is 838776021102.

2011206778380 is a `hidden beast` number, since 20 + 1 + 120 + 67 + 78 + 380 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (2011206778381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 126332061 + ... + 126347979.

It is an arithmetic number, because the mean of its divisors is an integer number (33355106400).

Almost surely, 2^{2011206778380} is an apocalyptic number.

2011206778380 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 2011206778380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3202090214400).

2011206778380 is an abundant number, since it is smaller than the sum of its proper divisors (4392973650420).

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

2011206778380 is a wasteful number, since it uses less digits than its factorization.

2011206778380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21421 (or 21413 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 2011206778380 in words is "two trillion, eleven billion, two hundred six million, seven hundred seventy-eight thousand, three hundred eighty".