1216503673 has 8 divisors (see below), whose sum is σ = 1516680000. Its totient is φ = 947924880.

The previous prime is 1216503641. The next prime is 1216503683. The reversal of 1216503673 is 3763056121.

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

It is not a de Polignac number, because 1216503673 - 2⁵ = 1216503641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216503683) 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, 7899298 + ... + 7899451.

It is an arithmetic number, because the mean of its divisors is an integer number (189585000).

Almost surely, 2^1216503673 is an apocalyptic number.

It is an amenable number.

1216503673 is a deficient number, since it is larger than the sum of its proper divisors (300176327).

1216503673 is a wasteful number, since it uses less digits than its factorization.

1216503673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15798767.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1216503673 is about 34878.4127075760. The cubic root of 1216503673 is about 1067.5080077719.

Adding to 1216503673 its reverse (3763056121), we get a palindrome (4979559794).

The spelling of 1216503673 in words is "one billion, two hundred sixteen million, five hundred three thousand, six hundred seventy-three".