403778850966 has 256 divisors, whose sum is σ = 971892864000. Its totient is φ = 125550456192.

The previous prime is 403778850953. The next prime is 403778850973. The reversal of 403778850966 is 669058877304.

403778850966 is a `hidden beast` number, since 40 + 3 + 7 + 7 + 88 + 509 + 6 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1065379365 + ... + 1065379743.

It is an arithmetic number, because the mean of its divisors is an integer number (3796456500).

Almost surely, 2^403778850966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 403778850966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485946432000).

403778850966 is an abundant number, since it is smaller than the sum of its proper divisors (568114013034).

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

403778850966 is a wasteful number, since it uses less digits than its factorization.

403778850966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 63.

The spelling of 403778850966 in words is "four hundred three billion, seven hundred seventy-eight million, eight hundred fifty thousand, nine hundred sixty-six".