1216464669 has 32 divisors (see below), whose sum is σ = 2103459840. Its totient is φ = 680327856.

The previous prime is 1216464661. The next prime is 1216464671. The reversal of 1216464669 is 9664646121.

It is a happy number.

1216464669 is a `hidden beast` number, since 121 + 6 + 464 + 6 + 69 = 666.

It is not a de Polignac number, because 1216464669 - 2³ = 1216464661 is a prime.

It is a super-2 number, since 2×1216464669² = 2959572581850559122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216464661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59589 + ... + 77354.

It is an arithmetic number, because the mean of its divisors is an integer number (65733120).

Almost surely, 2^1216464669 is an apocalyptic number.

It is an amenable number.

1216464669 is a deficient number, since it is larger than the sum of its proper divisors (886995171).

1216464669 is a wasteful number, since it uses less digits than its factorization.

1216464669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137006 (or 137000 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 1216464669 is about 34877.8535606766. The cubic root of 1216464669 is about 1067.4965987017.

The spelling of 1216464669 in words is "one billion, two hundred sixteen million, four hundred sixty-four thousand, six hundred sixty-nine".