378451906631 has 2 divisors, whose sum is σ = 378451906632. Its totient is φ = 378451906630.

The previous prime is 378451906561. The next prime is 378451906639. The reversal of 378451906631 is 136609154873.

It is a strong prime.

It is an emirp because it is prime and its reverse (136609154873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378451906631 is a prime.

It is a super-2 number, since 2×378451906631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378451906639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189225953315 + 189225953316.

It is an arithmetic number, because the mean of its divisors is an integer number (189225953316).

Almost surely, 2^378451906631 is an apocalyptic number.

378451906631 is a deficient number, since it is larger than the sum of its proper divisors (1).

378451906631 is an equidigital number, since it uses as much as digits as its factorization.

378451906631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 378451906631 in words is "three hundred seventy-eight billion, four hundred fifty-one million, nine hundred six thousand, six hundred thirty-one".