1611657845 has 16 divisors (see below), whose sum is σ = 2261677440. Its totient is φ = 1079434944.

The previous prime is 1611657823. The next prime is 1611657869. The reversal of 1611657845 is 5487561161.

It is not a de Polignac number, because 1611657845 - 2²² = 1607463541 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1611657796 and 1611657805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 533930 + ... + 536939.

It is an arithmetic number, because the mean of its divisors is an integer number (141354840).

Almost surely, 2^1611657845 is an apocalyptic number.

It is an amenable number.

1611657845 is a deficient number, since it is larger than the sum of its proper divisors (650019595).

1611657845 is a wasteful number, since it uses less digits than its factorization.

1611657845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070924.

The product of its digits is 201600, while the sum is 44.

The square root of 1611657845 is about 40145.4585850006. The cubic root of 1611657845 is about 1172.4408694151.

The spelling of 1611657845 in words is "one billion, six hundred eleven million, six hundred fifty-seven thousand, eight hundred forty-five".