121557350566 has 8 divisors (see below), whose sum is σ = 182406406464. Its totient is φ = 60755215080.

The previous prime is 121557350561. The next prime is 121557350587. The reversal of 121557350566 is 665053755121.

It is a happy number.

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

It is a super-3 number, since 3×121557350566³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121557350561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11723625 + ... + 11733988.

It is an arithmetic number, because the mean of its divisors is an integer number (22800800808).

Almost surely, 2^121557350566 is an apocalyptic number.

121557350566 is a deficient number, since it is larger than the sum of its proper divisors (60849055898).

121557350566 is a wasteful number, since it uses less digits than its factorization.

121557350566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23460206.

The product of its (nonzero) digits is 945000, while the sum is 46.

The spelling of 121557350566 in words is "one hundred twenty-one billion, five hundred fifty-seven million, three hundred fifty thousand, five hundred sixty-six".