1226061645 has 16 divisors (see below), whose sum is σ = 1988572992. Its totient is φ = 644941440.

The previous prime is 1226061587. The next prime is 1226061677. The reversal of 1226061645 is 5461606221.

It is not a de Polignac number, because 1226061645 - 2⁷ = 1226061517 is a prime.

It is a super-3 number, since 3×1226061645³ (a number of 28 digits) contains 333 as substring.

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, 558751 + ... + 560940.

It is an arithmetic number, because the mean of its divisors is an integer number (124285812).

Almost surely, 2^1226061645 is an apocalyptic number.

1226061645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1226061645 is a deficient number, since it is larger than the sum of its proper divisors (762511347).

1226061645 is a wasteful number, since it uses less digits than its factorization.

1226061645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119772.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1226061645 is about 35015.1630725890. The cubic root of 1226061645 is about 1070.2964925000.

Adding to 1226061645 its reverse (5461606221), we get a palindrome (6687667866).

It can be divided in two parts, 122606 and 1645, that added together give a triangular number (124251 = T₄₉₈).

The spelling of 1226061645 in words is "one billion, two hundred twenty-six million, sixty-one thousand, six hundred forty-five".