1965779955 has 32 divisors (see below), whose sum is σ = 3700296000. Its totient is φ = 986743296.

The previous prime is 1965779953. The next prime is 1965779971. The reversal of 1965779955 is 5599775691.

1965779955 is a `hidden beast` number, since 1 + 9 + 6 + 577 + 9 + 9 + 55 = 666.

It is not a de Polignac number, because 1965779955 - 2¹ = 1965779953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1965779892 and 1965779901.

It is not an unprimeable number, because it can be changed into a prime (1965779953) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425980 + ... + 430569.

It is an arithmetic number, because the mean of its divisors is an integer number (115634250).

Almost surely, 2^1965779955 is an apocalyptic number.

1965779955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1965779955 is a deficient number, since it is larger than the sum of its proper divisors (1734516045).

1965779955 is a wasteful number, since it uses less digits than its factorization.

1965779955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856580 (or 856574 counting only the distinct ones).

The product of its digits is 26790750, while the sum is 63.

The square root of 1965779955 is about 44337.1171254966. The cubic root of 1965779955 is about 1252.6939138253.

The spelling of 1965779955 in words is "one billion, nine hundred sixty-five million, seven hundred seventy-nine thousand, nine hundred fifty-five".