120644256645415 has 4 divisors (see below), whose sum is σ = 144773107974504. Its totient is φ = 96515405316328.

The previous prime is 120644256645403. The next prime is 120644256645421. The reversal of 120644256645415 is 514546652446021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 120644256645415 - 2⁹ = 120644256644903 is a prime.

It is a super-2 number, since 2×120644256645415² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12064425664537 + ... + 12064425664546.

It is an arithmetic number, because the mean of its divisors is an integer number (36193276993626).

Almost surely, 2^{120644256645415} is an apocalyptic number.

120644256645415 is a deficient number, since it is larger than the sum of its proper divisors (24128851329089).

120644256645415 is an equidigital number, since it uses as much as digits as its factorization.

120644256645415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24128851329088.

The product of its (nonzero) digits is 27648000, while the sum is 55.

The spelling of 120644256645415 in words is "one hundred twenty trillion, six hundred forty-four billion, two hundred fifty-six million, six hundred forty-five thousand, four hundred fifteen".