1641520356433 has 4 divisors (see below), whose sum is σ = 1646798557248. Its totient is φ = 1636242155620.

The previous prime is 1641520356367. The next prime is 1641520356449. The reversal of 1641520356433 is 3346530251461.

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 1641520356433 - 2⁹ = 1641520355921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641520356433.

It is not an unprimeable number, because it can be changed into a prime (1641520356733) 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, 2639099941 + ... + 2639100562.

It is an arithmetic number, because the mean of its divisors is an integer number (411699639312).

Almost surely, 2^{1641520356433} is an apocalyptic number.

It is an amenable number.

1641520356433 is a deficient number, since it is larger than the sum of its proper divisors (5278200815).

1641520356433 is an equidigital number, since it uses as much as digits as its factorization.

1641520356433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278200814.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 1641520356433 in words is "one trillion, six hundred forty-one billion, five hundred twenty million, three hundred fifty-six thousand, four hundred thirty-three".