1672159975821 has 24 divisors (see below), whose sum is σ = 2426567925600. Its totient is φ = 1109603565216.

The previous prime is 1672159975817. The next prime is 1672159975859. The reversal of 1672159975821 is 1285799512761.

1672159975821 is a `hidden beast` number, since 16 + 7 + 2 + 1 + 599 + 7 + 5 + 8 + 21 = 666.

It is not a de Polignac number, because 1672159975821 - 2² = 1672159975817 is a prime.

It is a super-2 number, since 2×1672159975821² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672159975121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1295590 + ... + 2241176.

It is an arithmetic number, because the mean of its divisors is an integer number (101106996900).

Almost surely, 2^{1672159975821} is an apocalyptic number.

It is an amenable number.

1672159975821 is a deficient number, since it is larger than the sum of its proper divisors (754407949779).

1672159975821 is a wasteful number, since it uses less digits than its factorization.

1672159975821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946505 (or 946502 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 63.

The spelling of 1672159975821 in words is "one trillion, six hundred seventy-two billion, one hundred fifty-nine million, nine hundred seventy-five thousand, eight hundred twenty-one".