403661956161 has 4 divisors (see below), whose sum is σ = 538215941552. Its totient is φ = 269107970772.

The previous prime is 403661956157. The next prime is 403661956241. The reversal of 403661956161 is 161659166304.

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 not a de Polignac number, because 403661956161 - 2² = 403661956157 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 403661956161.

It is not an unprimeable number, because it can be changed into a prime (403661956121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67276992691 + ... + 67276992696.

It is an arithmetic number, because the mean of its divisors is an integer number (134553985388).

Almost surely, 2^403661956161 is an apocalyptic number.

It is an amenable number.

403661956161 is a deficient number, since it is larger than the sum of its proper divisors (134553985391).

403661956161 is a wasteful number, since it uses less digits than its factorization.

403661956161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134553985390.

The product of its (nonzero) digits is 699840, while the sum is 48.

The spelling of 403661956161 in words is "four hundred three billion, six hundred sixty-one million, nine hundred fifty-six thousand, one hundred sixty-one".