378815690691 has 24 divisors (see below), whose sum is σ = 580703301360. Its totient is φ = 237139301376.

The previous prime is 378815690677. The next prime is 378815690719. The reversal of 378815690691 is 196096518873.

378815690691 is a `hidden beast` number, since 3 + 7 + 8 + 8 + 1 + 569 + 0 + 69 + 1 = 666.

It is not a de Polignac number, because 378815690691 - 2⁷ = 378815690563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (378815690611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2792781 + ... + 2925278.

It is an arithmetic number, because the mean of its divisors is an integer number (24195970890).

Almost surely, 2^378815690691 is an apocalyptic number.

378815690691 is a deficient number, since it is larger than the sum of its proper divisors (201887610669).

378815690691 is a wasteful number, since it uses less digits than its factorization.

378815690691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718515 (or 5718512 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 378815690691 in words is "three hundred seventy-eight billion, eight hundred fifteen million, six hundred ninety thousand, six hundred ninety-one".