1216611670 has 8 divisors (see below), whose sum is σ = 2189901024. Its totient is φ = 486644664.

The previous prime is 1216611653. The next prime is 1216611679. The reversal of 1216611670 is 761166121.

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

It is a super-3 number, since 3×1216611670³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216611679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60830574 + ... + 60830593.

It is an arithmetic number, because the mean of its divisors is an integer number (273737628).

Almost surely, 2^1216611670 is an apocalyptic number.

1216611670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216611670 is a deficient number, since it is larger than the sum of its proper divisors (973289354).

1216611670 is a wasteful number, since it uses less digits than its factorization.

1216611670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121661174.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1216611670 is about 34879.9608658037. The cubic root of 1216611670 is about 1067.5395967301.

Adding to 1216611670 its reverse (761166121), we get a palindrome (1977777791).

The spelling of 1216611670 in words is "one billion, two hundred sixteen million, six hundred eleven thousand, six hundred seventy".