66351405 has 8 divisors (see below), whose sum is σ = 106162272. Its totient is φ = 35387408.

The previous prime is 66351367. The next prime is 66351409. The reversal of 66351405 is 50415366.

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 66351405 - 2⁸ = 66351149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66351409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211699 + ... + 2211728.

It is an arithmetic number, because the mean of its divisors is an integer number (13270284).

Almost surely, 2^66351405 is an apocalyptic number.

It is an amenable number.

66351405 is a deficient number, since it is larger than the sum of its proper divisors (39810867).

66351405 is a wasteful number, since it uses less digits than its factorization.

66351405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423435.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66351405 is about 8145.6371758138. The cubic root of 66351405 is about 404.8399611543.

The spelling of 66351405 in words is "sixty-six million, three hundred fifty-one thousand, four hundred five".