120731354036661 has 4 divisors (see below), whose sum is σ = 160975138715552. Its totient is φ = 80487569357772.

The previous prime is 120731354036627. The next prime is 120731354036677. The reversal of 120731354036661 is 166630453137021.

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 120731354036661 - 2¹⁰ = 120731354035637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120731354036661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120731354032661) 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, 20121892339441 + ... + 20121892339446.

It is an arithmetic number, because the mean of its divisors is an integer number (40243784678888).

Almost surely, 2^{120731354036661} is an apocalyptic number.

It is an amenable number.

120731354036661 is a deficient number, since it is larger than the sum of its proper divisors (40243784678891).

120731354036661 is an equidigital number, since it uses as much as digits as its factorization.

120731354036661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40243784678890.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 120731354036661 in words is "one hundred twenty trillion, seven hundred thirty-one billion, three hundred fifty-four million, thirty-six thousand, six hundred sixty-one".