1225665511 has 8 divisors (see below), whose sum is σ = 1406774304. Its totient is φ = 1046060160.

The previous prime is 1225665503. The next prime is 1225665517. The reversal of 1225665511 is 1155665221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225665511 - 2³ = 1225665503 is a prime.

It is a super-2 number, since 2×1225665511² = 3004511889709782242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225665517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374110 + ... + 377371.

It is an arithmetic number, because the mean of its divisors is an integer number (175846788).

Almost surely, 2^1225665511 is an apocalyptic number.

1225665511 is a deficient number, since it is larger than the sum of its proper divisors (181108793).

1225665511 is an equidigital number, since it uses as much as digits as its factorization.

1225665511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751721.

The product of its digits is 18000, while the sum is 34.

The square root of 1225665511 is about 35009.5060090827. The cubic root of 1225665511 is about 1070.1812110478.

The spelling of 1225665511 in words is "one billion, two hundred twenty-five million, six hundred sixty-five thousand, five hundred eleven".