1825454805921 has 12 divisors (see below), whose sum is σ = 2698088240848. Its totient is φ = 1188668245464.

The previous prime is 1825454805919. The next prime is 1825454805929. The reversal of 1825454805921 is 1295084545281.

It is a happy number.

1825454805921 is a `hidden beast` number, since 1 + 8 + 2 + 5 + 4 + 5 + 48 + 0 + 592 + 1 = 666.

It is not a de Polignac number, because 1825454805921 - 2¹ = 1825454805919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1825454805929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2358468355 + ... + 2358469128.

Almost surely, 2^{1825454805921} is an apocalyptic number.

It is an amenable number.

1825454805921 is a deficient number, since it is larger than the sum of its proper divisors (872633434927).

1825454805921 is a wasteful number, since it uses less digits than its factorization.

1825454805921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716937532 (or 4716937529 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 54.

The spelling of 1825454805921 in words is "one trillion, eight hundred twenty-five billion, four hundred fifty-four million, eight hundred five thousand, nine hundred twenty-one".