1605677620161 has 4 divisors (see below), whose sum is σ = 2140903493552. Its totient is φ = 1070451746772.

The previous prime is 1605677620139. The next prime is 1605677620177. The reversal of 1605677620161 is 1610267765061.

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 1605677620161 - 2¹¹ = 1605677618113 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 1605677620161.

It is not an unprimeable number, because it can be changed into a prime (1605677620181) 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, 267612936691 + ... + 267612936696.

It is an arithmetic number, because the mean of its divisors is an integer number (535225873388).

Almost surely, 2^{1605677620161} is an apocalyptic number.

It is an amenable number.

1605677620161 is a deficient number, since it is larger than the sum of its proper divisors (535225873391).

1605677620161 is an equidigital number, since it uses as much as digits as its factorization.

1605677620161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535225873390.

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 1605677620161 in words is "one trillion, six hundred five billion, six hundred seventy-seven million, six hundred twenty thousand, one hundred sixty-one".