378816312569 has 2 divisors, whose sum is σ = 378816312570. Its totient is φ = 378816312568.

The previous prime is 378816312547. The next prime is 378816312583. The reversal of 378816312569 is 965213618873.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261980185600 + 116836126969 = 511840^2 + 341813^2 .

It is a cyclic number.

It is not a de Polignac number, because 378816312569 - 2¹² = 378816308473 is a prime.

It is a super-2 number, since 2×378816312569² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (378816312169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189408156284 + 189408156285.

It is an arithmetic number, because the mean of its divisors is an integer number (189408156285).

Almost surely, 2^378816312569 is an apocalyptic number.

It is an amenable number.

378816312569 is a deficient number, since it is larger than the sum of its proper divisors (1).

378816312569 is an equidigital number, since it uses as much as digits as its factorization.

378816312569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 59.

The spelling of 378816312569 in words is "three hundred seventy-eight billion, eight hundred sixteen million, three hundred twelve thousand, five hundred sixty-nine".