1678945725 has 60 divisors (see below), whose sum is σ = 3141162420. Its totient is φ = 886464000.

The previous prime is 1678945717. The next prime is 1678945727. The reversal of 1678945725 is 5275498761.

1678945725 is a `hidden beast` number, since 1 + 67 + 8 + 9 + 4 + 572 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 19686969 + 1659258756 = 4437^2 + 40734^2 .

It is not a de Polignac number, because 1678945725 - 2³ = 1678945717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678945727) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 200421 + ... + 208629.

It is an arithmetic number, because the mean of its divisors is an integer number (52352707).

Almost surely, 2^1678945725 is an apocalyptic number.

1678945725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1678945725 is a deficient number, since it is larger than the sum of its proper divisors (1462216695).

1678945725 is a wasteful number, since it uses less digits than its factorization.

1678945725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8332 (or 8318 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The square root of 1678945725 is about 40974.9402073999. The cubic root of 1678945725 is about 1188.5356667583.

The spelling of 1678945725 in words is "one billion, six hundred seventy-eight million, nine hundred forty-five thousand, seven hundred twenty-five".