120640727481 has 4 divisors (see below), whose sum is σ = 160854303312. Its totient is φ = 80427151652.

The previous prime is 120640727453. The next prime is 120640727521. The reversal of 120640727481 is 184727046021.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120640727481 is a prime.

It is a super-2 number, since 2×120640727481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (120640727281) 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, 20106787911 + ... + 20106787916.

It is an arithmetic number, because the mean of its divisors is an integer number (40213575828).

Almost surely, 2^120640727481 is an apocalyptic number.

It is an amenable number.

120640727481 is a deficient number, since it is larger than the sum of its proper divisors (40213575831).

120640727481 is an equidigital number, since it uses as much as digits as its factorization.

120640727481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40213575830.

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 120640727481 in words is "one hundred twenty billion, six hundred forty million, seven hundred twenty-seven thousand, four hundred eighty-one".