1657123845 has 16 divisors (see below), whose sum is σ = 2855352192. Its totient is φ = 815814720.

The previous prime is 1657123823. The next prime is 1657123859. The reversal of 1657123845 is 5483217561.

It is a happy number.

It is not a de Polignac number, because 1657123845 - 2⁷ = 1657123717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1657123797 and 1657123806.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4248841 + ... + 4249230.

It is an arithmetic number, because the mean of its divisors is an integer number (178459512).

Almost surely, 2^1657123845 is an apocalyptic number.

1657123845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1657123845 is a deficient number, since it is larger than the sum of its proper divisors (1198228347).

1657123845 is a wasteful number, since it uses less digits than its factorization.

1657123845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8498092.

The product of its digits is 201600, while the sum is 42.

The square root of 1657123845 is about 40707.7860488629. The cubic root of 1657123845 is about 1183.3639156724.

The spelling of 1657123845 in words is "one billion, six hundred fifty-seven million, one hundred twenty-three thousand, eight hundred forty-five".