121566005473 has 4 divisors (see below), whose sum is σ = 132617460528. Its totient is φ = 110514550420.

The previous prime is 121566005471. The next prime is 121566005479. The reversal of 121566005473 is 374500665121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121566005473 - 2¹ = 121566005471 is a prime.

It is a super-2 number, since 2×121566005473² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121566005471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525727511 + ... + 5525727532.

It is an arithmetic number, because the mean of its divisors is an integer number (33154365132).

Almost surely, 2^121566005473 is an apocalyptic number.

It is an amenable number.

121566005473 is a deficient number, since it is larger than the sum of its proper divisors (11051455055).

121566005473 is a wasteful number, since it uses less digits than its factorization.

121566005473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11051455054.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 121566005473 in words is "one hundred twenty-one billion, five hundred sixty-six million, five thousand, four hundred seventy-three".