405948195881 has 4 divisors (see below), whose sum is σ = 405979822164. Its totient is φ = 405916569600.

The previous prime is 405948195871. The next prime is 405948195893. The reversal of 405948195881 is 188591849504.

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 186628320025 + 219319875856 = 432005^2 + 468316^2 .

It is a cyclic number.

It is not a de Polignac number, because 405948195881 - 2³⁰ = 404874454057 is a prime.

It is a super-2 number, since 2×405948195881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405948195871) 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, 15793880 + ... + 15819561.

It is an arithmetic number, because the mean of its divisors is an integer number (101494955541).

Almost surely, 2^405948195881 is an apocalyptic number.

It is an amenable number.

405948195881 is a deficient number, since it is larger than the sum of its proper divisors (31626283).

405948195881 is a wasteful number, since it uses less digits than its factorization.

405948195881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31626282.

The product of its (nonzero) digits is 16588800, while the sum is 62.

The spelling of 405948195881 in words is "four hundred five billion, nine hundred forty-eight million, one hundred ninety-five thousand, eight hundred eighty-one".