120765217557 has 4 divisors (see below), whose sum is σ = 161020290080. Its totient is φ = 80510145036.

The previous prime is 120765217541. The next prime is 120765217589. The reversal of 120765217557 is 755712567021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 120765217557 - 2⁴ = 120765217541 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 (120765217537) 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, 20127536257 + ... + 20127536262.

It is an arithmetic number, because the mean of its divisors is an integer number (40255072520).

Almost surely, 2^120765217557 is an apocalyptic number.

It is an amenable number.

120765217557 is a deficient number, since it is larger than the sum of its proper divisors (40255072523).

120765217557 is an equidigital number, since it uses as much as digits as its factorization.

120765217557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40255072522.

The product of its (nonzero) digits is 1029000, while the sum is 48.

The spelling of 120765217557 in words is "one hundred twenty billion, seven hundred sixty-five million, two hundred seventeen thousand, five hundred fifty-seven".