1961782855051 has 2 divisors, whose sum is σ = 1961782855052. Its totient is φ = 1961782855050.

The previous prime is 1961782855033. The next prime is 1961782855061. The reversal of 1961782855051 is 1505582871691.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961782855051 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961782855061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980891427525 + 980891427526.

It is an arithmetic number, because the mean of its divisors is an integer number (980891427526).

Almost surely, 2^{1961782855051} is an apocalyptic number.

1961782855051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961782855051 is an equidigital number, since it uses as much as digits as its factorization.

1961782855051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048000, while the sum is 58.

The spelling of 1961782855051 in words is "one trillion, nine hundred sixty-one billion, seven hundred eighty-two million, eight hundred fifty-five thousand, fifty-one".