378666681656 has 32 divisors (see below), whose sum is σ = 712549872000. Its totient is φ = 188654600160.

The previous prime is 378666681623. The next prime is 378666681661. The reversal of 378666681656 is 656186666873.

It is a super-4 number, since 4×378666681656⁴ (a number of 47 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2430671 + ... + 2581761.

It is an arithmetic number, because the mean of its divisors is an integer number (22267183500).

Almost surely, 2^378666681656 is an apocalyptic number.

It is an amenable number.

378666681656 is a deficient number, since it is larger than the sum of its proper divisors (333883190344).

378666681656 is a wasteful number, since it uses less digits than its factorization.

378666681656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152219 (or 152215 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 68.

The spelling of 378666681656 in words is "three hundred seventy-eight billion, six hundred sixty-six million, six hundred eighty-one thousand, six hundred fifty-six".