1672644141521 has 4 divisors (see below), whose sum is σ = 1745367799872. Its totient is φ = 1599920483172.

The previous prime is 1672644141517. The next prime is 1672644141523. The reversal of 1672644141521 is 1251414462761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1672644141521 - 2² = 1672644141517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1672644141523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36361829141 + ... + 36361829186.

It is an arithmetic number, because the mean of its divisors is an integer number (436341949968).

Almost surely, 2^{1672644141521} is an apocalyptic number.

It is an amenable number.

1672644141521 is a deficient number, since it is larger than the sum of its proper divisors (72723658351).

1672644141521 is an equidigital number, since it uses as much as digits as its factorization.

1672644141521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72723658350.

The product of its digits is 322560, while the sum is 44.

The spelling of 1672644141521 in words is "one trillion, six hundred seventy-two billion, six hundred forty-four million, one hundred forty-one thousand, five hundred twenty-one".