1673256750021 has 14 divisors (see below), whose sum is σ = 2508737487750. Its totient is φ = 1115504499528.

The previous prime is 1673256750007. The next prime is 1673256750031. The reversal of 1673256750021 is 1200576523761.

It is a happy number.

1673256750021 is a `hidden beast` number, since 1 + 6 + 7 + 32 + 567 + 50 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1491683609025 + 181573140996 = 1221345^2 + 426114^2 .

It is not a de Polignac number, because 1673256750021 - 2¹⁴ = 1673256733637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1673256750001) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1147637646 + ... + 1147639103.

Almost surely, 2^{1673256750021} is an apocalyptic number.

It is an amenable number.

1673256750021 is a deficient number, since it is larger than the sum of its proper divisors (835480737729).

1673256750021 is an frugal number, since it uses more digits than its factorization.

1673256750021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295276767 (or 2295276752 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 1673256750021 in words is "one trillion, six hundred seventy-three billion, two hundred fifty-six million, seven hundred fifty thousand, twenty-one".