120765217561 has 8 divisors (see below), whose sum is σ = 121099758080. Its totient is φ = 120431093328.

The previous prime is 120765217541. The next prime is 120765217589. The reversal of 120765217561 is 165712567021.

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 120765217561 - 2²⁷ = 120630999833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120765217541) 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, 481480 + ... + 688006.

It is an arithmetic number, because the mean of its divisors is an integer number (15137469760).

Almost surely, 2^120765217561 is an apocalyptic number.

It is an amenable number.

120765217561 is a deficient number, since it is larger than the sum of its proper divisors (334540519).

120765217561 is a wasteful number, since it uses less digits than its factorization.

120765217561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208143.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 120765217561 in words is "one hundred twenty billion, seven hundred sixty-five million, two hundred seventeen thousand, five hundred sixty-one".