1226616645 has 16 divisors (see below), whose sum is σ = 1964290752. Its totient is φ = 653627520.

The previous prime is 1226616631. The next prime is 1226616659. The reversal of 1226616645 is 5466166221.

It is an interprime number because it is at equal distance from previous prime (1226616631) and next prime (1226616659).

It is not a de Polignac number, because 1226616645 - 2⁵ = 1226616613 is a prime.

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, 17352 + ... + 52481.

It is an arithmetic number, because the mean of its divisors is an integer number (122768172).

Almost surely, 2^1226616645 is an apocalyptic number.

1226616645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1226616645 is a deficient number, since it is larger than the sum of its proper divisors (737674107).

1226616645 is a wasteful number, since it uses less digits than its factorization.

1226616645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71012.

The product of its digits is 103680, while the sum is 39.

The square root of 1226616645 is about 35023.0873139419. The cubic root of 1226616645 is about 1070.4579647902.

The spelling of 1226616645 in words is "one billion, two hundred twenty-six million, six hundred sixteen thousand, six hundred forty-five".