1611123345 has 32 divisors (see below), whose sum is σ = 3084547200. Its totient is φ = 793167552.

The previous prime is 1611123307. The next prime is 1611123347. The reversal of 1611123345 is 5433211161.

It is a happy number.

1611123345 is a `hidden beast` number, since 1 + 611 + 1 + 2 + 3 + 3 + 45 = 666.

It is not a de Polignac number, because 1611123345 - 2⁹ = 1611122833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1611123347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 457255 + ... + 460764.

It is an arithmetic number, because the mean of its divisors is an integer number (96392100).

Almost surely, 2^1611123345 is an apocalyptic number.

1611123345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1611123345 is a deficient number, since it is larger than the sum of its proper divisors (1473423855).

1611123345 is a wasteful number, since it uses less digits than its factorization.

1611123345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918046 (or 918040 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1611123345 is about 40138.8009910610. The cubic root of 1611123345 is about 1172.3112432795.

The spelling of 1611123345 in words is "one billion, six hundred eleven million, one hundred twenty-three thousand, three hundred forty-five".