1216663501 has 8 divisors (see below), whose sum is σ = 1235594880. Its totient is φ = 1197869232.

The previous prime is 1216663471. The next prime is 1216663517. The reversal of 1216663501 is 1053666121.

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 1216663501 - 2⁷ = 1216663373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216663571) 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, 16321 + ... + 51958.

It is an arithmetic number, because the mean of its divisors is an integer number (154449360).

Almost surely, 2^1216663501 is an apocalyptic number.

It is an amenable number.

1216663501 is a deficient number, since it is larger than the sum of its proper divisors (18931379).

1216663501 is a wasteful number, since it uses less digits than its factorization.

1216663501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68555.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1216663501 is about 34880.7038489764. The cubic root of 1216663501 is about 1067.5547565548.

The spelling of 1216663501 in words is "one billion, two hundred sixteen million, six hundred sixty-three thousand, five hundred one".