2145623506 has 16 divisors (see below), whose sum is σ = 3468861144. Its totient is φ = 989472384.

The previous prime is 2145623483. The next prime is 2145623537. The reversal of 2145623506 is 6053265412.

It can be written as a sum of positive squares in 4 ways, for example, as 1999431225 + 146192281 = 44715^2 + 12091^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1195 + ... + 65518.

Almost surely, 2^2145623506 is an apocalyptic number.

2145623506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2145623506 is a deficient number, since it is larger than the sum of its proper divisors (1323237638).

2145623506 is a wasteful number, since it uses less digits than its factorization.

2145623506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67965.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 2145623506 is about 46320.8754882720. The cubic root of 2145623506 is about 1289.7865372009.

Adding to 2145623506 its reverse (6053265412), we get a palindrome (8198888918).

The spelling of 2145623506 in words is "two billion, one hundred forty-five million, six hundred twenty-three thousand, five hundred six".