121377563511565 has 8 divisors (see below), whose sum is σ = 146415657765888. Its totient is φ = 96593663107920.

The previous prime is 121377563511511. The next prime is 121377563511613. The reversal of 121377563511565 is 565115365773121.

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

It is a de Polignac number, because none of the positive numbers 2^k-121377563511565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63548461617 + ... + 63548463526.

It is an arithmetic number, because the mean of its divisors is an integer number (18301957220736).

Almost surely, 2^{121377563511565} is an apocalyptic number.

It is an amenable number.

121377563511565 is a deficient number, since it is larger than the sum of its proper divisors (25038094254323).

121377563511565 is a wasteful number, since it uses less digits than its factorization.

121377563511565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127096925339.

The product of its digits is 19845000, while the sum is 58.

The spelling of 121377563511565 in words is "one hundred twenty-one trillion, three hundred seventy-seven billion, five hundred sixty-three million, five hundred eleven thousand, five hundred sixty-five".