1969778966850 has 120 divisors (see below), whose sum is σ = 5661794134260. Its totient is φ = 507161450880.

The previous prime is 1969778966843. The next prime is 1969778966893. The reversal of 1969778966850 is 586698779691.

It can be written as a sum of positive squares in 6 ways, for example, as 1030393496889 + 939385469961 = 1015083^2 + 969219^2 .

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 1969778966850.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 8268157 + ... + 8503056.

Almost surely, 2^{1969778966850} is an apocalyptic number.

1969778966850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1969778966850 is an abundant number, since it is smaller than the sum of its proper divisors (3692015167410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1969778966850 is a wasteful number, since it uses less digits than its factorization.

1969778966850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16771266 (or 16771252 counting only the distinct ones).

The product of its (nonzero) digits is 2469035520, while the sum is 81.

The spelling of 1969778966850 in words is "one trillion, nine hundred sixty-nine billion, seven hundred seventy-eight million, nine hundred sixty-six thousand, eight hundred fifty".