1641071764421 has 4 divisors (see below), whose sum is σ = 1659510773100. Its totient is φ = 1622632755744.

The previous prime is 1641071764379. The next prime is 1641071764439. The reversal of 1641071764421 is 1244671701461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 417645525025 + 1223426239396 = 646255^2 + 1106086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641071764421 - 2⁶ = 1641071764357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641071784421) 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, 9219504206 + ... + 9219504383.

It is an arithmetic number, because the mean of its divisors is an integer number (414877693275).

Almost surely, 2^{1641071764421} is an apocalyptic number.

It is an amenable number.

1641071764421 is a deficient number, since it is larger than the sum of its proper divisors (18439008679).

1641071764421 is an equidigital number, since it uses as much as digits as its factorization.

1641071764421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18439008678.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 1641071764421 in words is "one trillion, six hundred forty-one billion, seventy-one million, seven hundred sixty-four thousand, four hundred twenty-one".