1611623505 has 16 divisors (see below), whose sum is σ = 2661778944. Its totient is φ = 831805440.

The previous prime is 1611623483. The next prime is 1611623509. The reversal of 1611623505 is 5053261161.

It is not a de Polignac number, because 1611623505 - 2⁵ = 1611623473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1611623509) 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 15 ways as a sum of consecutive naturals, for example, 1732464 + ... + 1733393.

It is an arithmetic number, because the mean of its divisors is an integer number (166361184).

Almost surely, 2^1611623505 is an apocalyptic number.

1611623505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1611623505 is a deficient number, since it is larger than the sum of its proper divisors (1050155439).

1611623505 is a wasteful number, since it uses less digits than its factorization.

1611623505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465896.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1611623505 is about 40145.0308880190. The cubic root of 1611623505 is about 1172.4325421916.

Adding to 1611623505 its reverse (5053261161), we get a palindrome (6664884666).

It can be divided in two parts, 16116 and 23505, that added together give a triangular number (39621 = T₂₈₁).

The spelling of 1611623505 in words is "one billion, six hundred eleven million, six hundred twenty-three thousand, five hundred five".