667777425 has 48 divisors (see below), whose sum is σ = 1336021632. Its totient is φ = 287308800.

The previous prime is 667777421. The next prime is 667777433. The reversal of 667777425 is 524777766.

It is a happy number.

667777425 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667777425 - 2² = 667777421 is a prime.

It is a super-3 number, since 3×667777425³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (667777421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28486 + ... + 46335.

It is an arithmetic number, because the mean of its divisors is an integer number (27833784).

Almost surely, 2^667777425 is an apocalyptic number.

It is an amenable number.

667777425 is an abundant number, since it is smaller than the sum of its proper divisors (668244207).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667777425 is a wasteful number, since it uses less digits than its factorization.

667777425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74858 (or 74853 counting only the distinct ones).

The product of its digits is 3457440, while the sum is 51.

The square root of 667777425 is about 25841.3897652584. The cubic root of 667777425 is about 874.0653639235.

The spelling of 667777425 in words is "six hundred sixty-seven million, seven hundred seventy-seven thousand, four hundred twenty-five".