121505245565 has 8 divisors (see below), whose sum is σ = 159061412448. Its totient is φ = 88367451280.

The previous prime is 121505245553. The next prime is 121505245567. The reversal of 121505245565 is 565542505121.

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

It is not a de Polignac number, because 121505245565 - 2⁶ = 121505245501 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 (121505245567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1104593087 + ... + 1104593196.

It is an arithmetic number, because the mean of its divisors is an integer number (19882676556).

Almost surely, 2^121505245565 is an apocalyptic number.

It is an amenable number.

121505245565 is a deficient number, since it is larger than the sum of its proper divisors (37556166883).

121505245565 is a wasteful number, since it uses less digits than its factorization.

121505245565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209186299.

The product of its (nonzero) digits is 300000, while the sum is 41.

The spelling of 121505245565 in words is "one hundred twenty-one billion, five hundred five million, two hundred forty-five thousand, five hundred sixty-five".