678273125781 has 16 divisors (see below), whose sum is σ = 933720227840. Its totient is φ = 437509773360.

The previous prime is 678273125767. The next prime is 678273125809. The reversal of 678273125781 is 187521372876.

It is not a de Polignac number, because 678273125781 - 2¹¹ = 678273123733 is a prime.

It is a super-2 number, since 2×678273125781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678273125081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236305 + ... + 1188438.

It is an arithmetic number, because the mean of its divisors is an integer number (58357514240).

Almost surely, 2^678273125781 is an apocalyptic number.

It is an amenable number.

678273125781 is a deficient number, since it is larger than the sum of its proper divisors (255447102059).

678273125781 is a wasteful number, since it uses less digits than its factorization.

678273125781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429896.

The product of its digits is 7902720, while the sum is 57.

The spelling of 678273125781 in words is "six hundred seventy-eight billion, two hundred seventy-three million, one hundred twenty-five thousand, seven hundred eighty-one".