399755645161 has 4 divisors (see below), whose sum is σ = 400196390992. Its totient is φ = 399314899332.

The previous prime is 399755645153. The next prime is 399755645203. The reversal of 399755645161 is 161546557993.

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 399755645161 - 2³ = 399755645153 is a prime.

It is a super-3 number, since 3×399755645161³ (a number of 36 digits) contains 333 as substring.

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 399755645161.

It is not an unprimeable number, because it can be changed into a prime (399755645101) 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, 220371555 + ... + 220373368.

It is an arithmetic number, because the mean of its divisors is an integer number (100049097748).

Almost surely, 2^399755645161 is an apocalyptic number.

It is an amenable number.

399755645161 is a deficient number, since it is larger than the sum of its proper divisors (440745831).

399755645161 is an equidigital number, since it uses as much as digits as its factorization.

399755645161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440745830.

The product of its digits is 30618000, while the sum is 61.

The spelling of 399755645161 in words is "three hundred ninety-nine billion, seven hundred fifty-five million, six hundred forty-five thousand, one hundred sixty-one".