1618826065920 has 768 divisors, whose sum is σ = 6803491968000. Its totient is φ = 357245779968.

The previous prime is 1618826065907. The next prime is 1618826065939. The reversal of 1618826065920 is 295606288161.

1618826065920 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 8 + 2 + 606 + 5 + 9 + 20 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 56111019 + ... + 56139861.

It is an arithmetic number, because the mean of its divisors is an integer number (8858713500).

Almost surely, 2^{1618826065920} is an apocalyptic number.

1618826065920 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 1618826065920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3401745984000).

1618826065920 is an abundant number, since it is smaller than the sum of its proper divisors (5184665902080).

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

1618826065920 is a wasteful number, since it uses less digits than its factorization.

1618826065920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28915 (or 28889 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 1618826065920 in words is "one trillion, six hundred eighteen billion, eight hundred twenty-six million, sixty-five thousand, nine hundred twenty".