378978653966 has 32 divisors (see below), whose sum is σ = 658340794368. Its totient is φ = 161706528640.

The previous prime is 378978653927. The next prime is 378978653981. The reversal of 378978653966 is 669356879873.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1179620 + ... + 1466103.

It is an arithmetic number, because the mean of its divisors is an integer number (20573149824).

Almost surely, 2^378978653966 is an apocalyptic number.

378978653966 is a deficient number, since it is larger than the sum of its proper divisors (279362140402).

378978653966 is a wasteful number, since it uses less digits than its factorization.

378978653966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646136.

The product of its digits is 2469035520, while the sum is 77.

The spelling of 378978653966 in words is "three hundred seventy-eight billion, nine hundred seventy-eight million, six hundred fifty-three thousand, nine hundred sixty-six".