121664898 has 48 divisors (see below), whose sum is σ = 271140480. Its totient is φ = 39413088.

The previous prime is 121664897. The next prime is 121664909. The reversal of 121664898 is 898466121.

121664898 is a `hidden beast` number, since 1 + 2 + 166 + 489 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (121664897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94636 + ... + 95912.

It is an arithmetic number, because the mean of its divisors is an integer number (5648760).

Almost surely, 2^121664898 is an apocalyptic number.

121664898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121664898 is an abundant number, since it is smaller than the sum of its proper divisors (149475582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121664898 is a wasteful number, since it uses less digits than its factorization.

121664898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431 (or 1428 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 121664898 is about 11030.1812315120. The cubic root of 121664898 is about 495.5130523813.

The spelling of 121664898 in words is "one hundred twenty-one million, six hundred sixty-four thousand, eight hundred ninety-eight".