16661121417402 has 64 divisors (see below), whose sum is σ = 41546955608064. Its totient is φ = 4327320133440.

The previous prime is 16661121417361. The next prime is 16661121417407. The reversal of 16661121417402 is 20471412116661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (16661121417407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7264008 + ... + 9278364.

It is an arithmetic number, because the mean of its divisors is an integer number (649171181376).

Almost surely, 2^{16661121417402} is an apocalyptic number.

16661121417402 is an abundant number, since it is smaller than the sum of its proper divisors (24885834190662).

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

16661121417402 is a wasteful number, since it uses less digits than its factorization.

16661121417402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032283.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 16661121417402 in words is "sixteen trillion, six hundred sixty-one billion, one hundred twenty-one million, four hundred seventeen thousand, four hundred two".