678401122345 has 16 divisors (see below), whose sum is σ = 816350729040. Its totient is φ = 541208289024.

The previous prime is 678401122339. The next prime is 678401122411. The reversal of 678401122345 is 543221104876.

It can be written as a sum of positive squares in 8 ways, for example, as 58507869456 + 619893252889 = 241884^2 + 787333^2 .

It is a cyclic number.

It is not a de Polignac number, because 678401122345 - 2³ = 678401122337 is a prime.

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, 29957367 + ... + 29980003.

It is an arithmetic number, because the mean of its divisors is an integer number (51021920565).

Almost surely, 2^678401122345 is an apocalyptic number.

It is an amenable number.

678401122345 is a deficient number, since it is larger than the sum of its proper divisors (137949606695).

678401122345 is a wasteful number, since it uses less digits than its factorization.

678401122345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39084.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 678401122345 in words is "six hundred seventy-eight billion, four hundred one million, one hundred twenty-two thousand, three hundred forty-five".