1025721621673 has 8 divisors (see below), whose sum is σ = 1172514224448. Its totient is φ = 878994254544.

The previous prime is 1025721621623. The next prime is 1025721621707. The reversal of 1025721621673 is 3761261275201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1025721621673 - 2¹⁷ = 1025721490601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1025721621623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16275211 + ... + 16338112.

It is an arithmetic number, because the mean of its divisors is an integer number (146564278056).

Almost surely, 2^{1025721621673} is an apocalyptic number.

It is an amenable number.

1025721621673 is a deficient number, since it is larger than the sum of its proper divisors (146792602775).

1025721621673 is an equidigital number, since it uses as much as digits as its factorization.

1025721621673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32617823.

The product of its (nonzero) digits is 211680, while the sum is 43.

Adding to 1025721621673 its reverse (3761261275201), we get a palindrome (4786982896874).

The spelling of 1025721621673 in words is "one trillion, twenty-five billion, seven hundred twenty-one million, six hundred twenty-one thousand, six hundred seventy-three".