1227745665 has 24 divisors (see below), whose sum is σ = 2129307648. Its totient is φ = 654423840.

The previous prime is 1227745663. The next prime is 1227745679. The reversal of 1227745665 is 5665477221.

1227745665 is a `hidden beast` number, since 12 + 2 + 7 + 74 + 566 + 5 = 666.

It is not a de Polignac number, because 1227745665 - 2¹ = 1227745663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1227745665.

It is not an unprimeable number, because it can be changed into a prime (1227745663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83712 + ... + 97278.

It is an arithmetic number, because the mean of its divisors is an integer number (88721152).

Almost surely, 2^1227745665 is an apocalyptic number.

1227745665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1227745665 is a deficient number, since it is larger than the sum of its proper divisors (901561983).

1227745665 is a wasteful number, since it uses less digits than its factorization.

1227745665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15589 (or 15586 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The square root of 1227745665 is about 35039.2018316628. The cubic root of 1227745665 is about 1070.7862928089.

The spelling of 1227745665 in words is "one billion, two hundred twenty-seven million, seven hundred forty-five thousand, six hundred sixty-five".