1521920043774 has 72 divisors (see below), whose sum is σ = 3571364049552. Its totient is φ = 468190569600.

The previous prime is 1521920043739. The next prime is 1521920043797. The reversal of 1521920043774 is 4773400291251.

1521920043774 is a `hidden beast` number, since 1 + 5 + 2 + 1 + 9 + 200 + 437 + 7 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16230994 + ... + 16324490.

It is an arithmetic number, because the mean of its divisors is an integer number (49602278466).

Almost surely, 2^{1521920043774} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1521920043774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1785682024776).

1521920043774 is an abundant number, since it is smaller than the sum of its proper divisors (2049444005778).

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

1521920043774 is a wasteful number, since it uses less digits than its factorization.

1521920043774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98882 (or 98866 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 1521920043774 in words is "one trillion, five hundred twenty-one billion, nine hundred twenty million, forty-three thousand, seven hundred seventy-four".