121566314623 has 4 divisors (see below), whose sum is σ = 130917569608. Its totient is φ = 112215059640.

The previous prime is 121566314621. The next prime is 121566314629. The reversal of 121566314623 is 326413665121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121566314623 - 2¹ = 121566314621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121566314621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4675627473 + ... + 4675627498.

It is an arithmetic number, because the mean of its divisors is an integer number (32729392402).

Almost surely, 2^121566314623 is an apocalyptic number.

121566314623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121566314623 is a deficient number, since it is larger than the sum of its proper divisors (9351254985).

121566314623 is an equidigital number, since it uses as much as digits as its factorization.

121566314623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9351254984.

The product of its digits is 155520, while the sum is 40.

Adding to 121566314623 its reverse (326413665121), we get a palindrome (447979979744).

The spelling of 121566314623 in words is "one hundred twenty-one billion, five hundred sixty-six million, three hundred fourteen thousand, six hundred twenty-three".