66251005 has 8 divisors (see below), whose sum is σ = 83685600. Its totient is φ = 50211216.

The previous prime is 66250997. The next prime is 66251021. The reversal of 66251005 is 50015266.

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

It is a cyclic number.

It is not a de Polignac number, because 66251005 - 2³ = 66250997 is a prime.

It is a congruent 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, 348595 + ... + 348784.

It is an arithmetic number, because the mean of its divisors is an integer number (10460700).

Almost surely, 2^66251005 is an apocalyptic number.

It is an amenable number.

66251005 is a deficient number, since it is larger than the sum of its proper divisors (17434595).

66251005 is a wasteful number, since it uses less digits than its factorization.

66251005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697403.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 66251005 is about 8139.4720344750. The cubic root of 66251005 is about 404.6356627898.

The spelling of 66251005 in words is "sixty-six million, two hundred fifty-one thousand, five".