405269721811 has 4 divisors (see below), whose sum is σ = 405314725792. Its totient is φ = 405224717832.

The previous prime is 405269721799. The next prime is 405269721853. The reversal of 405269721811 is 118127962504.

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

It is a cyclic number.

It is not a de Polignac number, because 405269721811 - 2²³ = 405261333203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405269721881) 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, 22488480 + ... + 22506493.

It is an arithmetic number, because the mean of its divisors is an integer number (101328681448).

Almost surely, 2^405269721811 is an apocalyptic number.

405269721811 is a deficient number, since it is larger than the sum of its proper divisors (45003981).

405269721811 is an equidigital number, since it uses as much as digits as its factorization.

405269721811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45003980.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 405269721811 in words is "four hundred five billion, two hundred sixty-nine million, seven hundred twenty-one thousand, eight hundred eleven".