121645561265 has 8 divisors (see below), whose sum is σ = 146372426880. Its totient is φ = 97051280112.

The previous prime is 121645561241. The next prime is 121645561277. The reversal of 121645561265 is 562165546121.

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

It is a cyclic number.

It is not a de Polignac number, because 121645561265 - 2⁶ = 121645561201 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33144095 + ... + 33147764.

It is an arithmetic number, because the mean of its divisors is an integer number (18296553360).

Almost surely, 2^121645561265 is an apocalyptic number.

It is an amenable number.

121645561265 is a deficient number, since it is larger than the sum of its proper divisors (24726865615).

121645561265 is an equidigital number, since it uses as much as digits as its factorization.

121645561265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66292231.

The product of its digits is 432000, while the sum is 44.

The spelling of 121645561265 in words is "one hundred twenty-one billion, six hundred forty-five million, five hundred sixty-one thousand, two hundred sixty-five".