1981500001452 has 18 divisors (see below), whose sum is σ = 5008791670428. Its totient is φ = 660500000472.

The previous prime is 1981500001447. The next prime is 1981500001483. The reversal of 1981500001452 is 2541000051891.

1981500001452 is a `hidden beast` number, since 1 + 9 + 8 + 1 + 500 + 0 + 0 + 145 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 55041666707 = 1981500001452 / (1 + 9 + 8 + 1 + 5 + 0 + 0 + 0 + 0 + 1 + 4 + 5 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27520833318 + ... + 27520833389.

Almost surely, 2^{1981500001452} is an apocalyptic number.

1981500001452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1981500001452 is an abundant number, since it is smaller than the sum of its proper divisors (3027291668976).

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

1981500001452 is a wasteful number, since it uses less digits than its factorization.

1981500001452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55041666717 (or 55041666712 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 1981500001452 in words is "one trillion, nine hundred eighty-one billion, five hundred million, one thousand, four hundred fifty-two".