66625955 has 8 divisors (see below), whose sum is σ = 87219504. Its totient is φ = 48455200.

The previous prime is 66625891. The next prime is 66625961. The reversal of 66625955 is 55952666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66625955 - 2⁶ = 66625891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605636 + ... + 605745.

It is an arithmetic number, because the mean of its divisors is an integer number (10902438).

Almost surely, 2^66625955 is an apocalyptic number.

66625955 is a deficient number, since it is larger than the sum of its proper divisors (20593549).

66625955 is a wasteful number, since it uses less digits than its factorization.

66625955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211397.

The product of its digits is 486000, while the sum is 44.

The square root of 66625955 is about 8162.4723582993. The cubic root of 66625955 is about 405.3975773710.

Subtracting from 66625955 its reverse (55952666), we obtain a square (10673289 = 3267²).

The spelling of 66625955 in words is "sixty-six million, six hundred twenty-five thousand, nine hundred fifty-five".