120105262557661 has 4 divisors (see below), whose sum is σ = 120301192839772. Its totient is φ = 119909332275552.

The previous prime is 120105262557593. The next prime is 120105262557691. The reversal of 120105262557661 is 166755262501021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30467805655225 + 89637456902436 = 5519765^2 + 9467706^2 .

It is a cyclic number.

It is not a de Polignac number, because 120105262557661 - 2¹⁵ = 120105262524893 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 (120105262557691) 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, 97965140136 + ... + 97965141361.

It is an arithmetic number, because the mean of its divisors is an integer number (30075298209943).

Almost surely, 2^{120105262557661} is an apocalyptic number.

It is an amenable number.

120105262557661 is a deficient number, since it is larger than the sum of its proper divisors (195930282111).

120105262557661 is an equidigital number, since it uses as much as digits as its factorization.

120105262557661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195930282110.

The product of its (nonzero) digits is 1512000, while the sum is 49.

The spelling of 120105262557661 in words is "one hundred twenty trillion, one hundred five billion, two hundred sixty-two million, five hundred fifty-seven thousand, six hundred sixty-one".