406255506661 has 4 divisors (see below), whose sum is σ = 406256988172. Its totient is φ = 406254025152.

The previous prime is 406255506659. The next prime is 406255506673. The reversal of 406255506661 is 166605552604.

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 141004756036 + 265250750625 = 375506^2 + 515025^2 .

It is a cyclic number.

It is not a de Polignac number, because 406255506661 - 2¹ = 406255506659 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 (406255506361) 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, 195786 + ... + 922411.

It is an arithmetic number, because the mean of its divisors is an integer number (101564247043).

Almost surely, 2^406255506661 is an apocalyptic number.

It is an amenable number.

406255506661 is a deficient number, since it is larger than the sum of its proper divisors (1481511).

406255506661 is a wasteful number, since it uses less digits than its factorization.

406255506661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481510.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 406255506661 in words is "four hundred six billion, two hundred fifty-five million, five hundred six thousand, six hundred sixty-one".