1651226665 has 16 divisors (see below), whose sum is σ = 2162494656. Its totient is φ = 1200398400.

The previous prime is 1651226663. The next prime is 1651226719. The reversal of 1651226665 is 5666221561.

It is not a de Polignac number, because 1651226665 - 2¹ = 1651226663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651226663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178699 + ... + 187711.

It is an arithmetic number, because the mean of its divisors is an integer number (135155916).

Almost surely, 2^1651226665 is an apocalyptic number.

It is an amenable number.

1651226665 is a deficient number, since it is larger than the sum of its proper divisors (511267991).

1651226665 is a wasteful number, since it uses less digits than its factorization.

1651226665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12360.

The product of its digits is 129600, while the sum is 40.

The square root of 1651226665 is about 40635.2884202881. The cubic root of 1651226665 is about 1181.9585078335.

The spelling of 1651226665 in words is "one billion, six hundred fifty-one million, two hundred twenty-six thousand, six hundred sixty-five".