2051161167420 has 144 divisors (see below), whose sum is σ = 6590916809568. Its totient is φ = 514561351680.

The previous prime is 2051161167413. The next prime is 2051161167431. The reversal of 2051161167420 is 247611611502.

2051161167420 is a `hidden beast` number, since 2 + 0 + 5 + 11 + 61 + 167 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6457567 + ... + 6767753.

It is an arithmetic number, because the mean of its divisors is an integer number (45770255622).

Almost surely, 2^{2051161167420} is an apocalyptic number.

2051161167420 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 2051161167420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3295458404784).

2051161167420 is an abundant number, since it is smaller than the sum of its proper divisors (4539755642148).

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

2051161167420 is a wasteful number, since it uses less digits than its factorization.

2051161167420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312380 (or 312375 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 2051161167420 its reverse (247611611502), we get a palindrome (2298772778922).

The spelling of 2051161167420 in words is "two trillion, fifty-one billion, one hundred sixty-one million, one hundred sixty-seven thousand, four hundred twenty".