1960405561 has 8 divisors (see below), whose sum is σ = 2008856960. Its totient is φ = 1912084272.

The previous prime is 1960405553. The next prime is 1960405589. The reversal of 1960405561 is 1655040691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1960405561 - 2³ = 1960405553 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 1960405561.

It is not an unprimeable number, because it can be changed into a prime (1960405501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1665 + ... + 62638.

It is an arithmetic number, because the mean of its divisors is an integer number (251107120).

Almost surely, 2^1960405561 is an apocalyptic number.

It is an amenable number.

1960405561 is a deficient number, since it is larger than the sum of its proper divisors (48451399).

1960405561 is an equidigital number, since it uses as much as digits as its factorization.

1960405561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65055.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1960405561 is about 44276.4673500495. The cubic root of 1960405561 is about 1251.5512604232.

It can be divided in two parts, 196040 and 5561, that added together give a square (201601 = 449²).

The spelling of 1960405561 in words is "one billion, nine hundred sixty million, four hundred five thousand, five hundred sixty-one".