1961216776 has 8 divisors (see below), whose sum is σ = 3677281470. Its totient is φ = 980608384.

The previous prime is 1961216773. The next prime is 1961216819. The reversal of 1961216776 is 6776121691.

It can be written as a sum of positive squares in only one way, i.e., 1233835876 + 727380900 = 35126^2 + 26970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1961216773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122576041 + ... + 122576056.

Almost surely, 2^1961216776 is an apocalyptic number.

It is an amenable number.

1961216776 is a deficient number, since it is larger than the sum of its proper divisors (1716064694).

1961216776 is a wasteful number, since it uses less digits than its factorization.

1961216776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245152103 (or 245152099 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The square root of 1961216776 is about 44285.6271943844. The cubic root of 1961216776 is about 1251.7238670796.

The spelling of 1961216776 in words is "one billion, nine hundred sixty-one million, two hundred sixteen thousand, seven hundred seventy-six".