121611664 has 10 divisors (see below), whose sum is σ = 235622630. Its totient is φ = 60805824.

The previous prime is 121611653. The next prime is 121611691. The reversal of 121611664 is 466116121.

It can be written as a sum of positive squares in only one way, i.e., 121176064 + 435600 = 11008^2 + 660^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3800349 + ... + 3800380.

It is an arithmetic number, because the mean of its divisors is an integer number (23562263).

Almost surely, 2^121611664 is an apocalyptic number.

It is an amenable number.

121611664 is a deficient number, since it is larger than the sum of its proper divisors (114010966).

121611664 is an equidigital number, since it uses as much as digits as its factorization.

121611664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7600737 (or 7600731 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 121611664 is about 11027.7678611766. The cubic root of 121611664 is about 495.4407719059.

Adding to 121611664 its reverse (466116121), we get a palindrome (587727785).

It can be divided in two parts, 1216 and 11664, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 121611664 in words is "one hundred twenty-one million, six hundred eleven thousand, six hundred sixty-four".