1657161001 has 4 divisors (see below), whose sum is σ = 1697579604. Its totient is φ = 1616742400.

The previous prime is 1657160977. The next prime is 1657161013. The reversal of 1657161001 is 1001617561.

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 903603600 + 753557401 = 30060^2 + 27451^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657161001 - 2¹¹ = 1657158953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1657161041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20209240 + ... + 20209321.

It is an arithmetic number, because the mean of its divisors is an integer number (424394901).

Almost surely, 2^1657161001 is an apocalyptic number.

It is an amenable number.

1657161001 is a deficient number, since it is larger than the sum of its proper divisors (40418603).

1657161001 is an equidigital number, since it uses as much as digits as its factorization.

1657161001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40418602.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 1657161001 is about 40708.2424209152. The cubic root of 1657161001 is about 1183.3727600609.

Adding to 1657161001 its reverse (1001617561), we get a palindrome (2658778562).

The spelling of 1657161001 in words is "one billion, six hundred fifty-seven million, one hundred sixty-one thousand, one".