66351407 has 4 divisors (see below), whose sum is σ = 67969776. Its totient is φ = 64733040.

The previous prime is 66351367. The next prime is 66351409. The reversal of 66351407 is 70415366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66351407 - 2²² = 62157103 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 809123 + ... + 809204.

It is an arithmetic number, because the mean of its divisors is an integer number (16992444).

Almost surely, 2^66351407 is an apocalyptic number.

66351407 is a deficient number, since it is larger than the sum of its proper divisors (1618369).

66351407 is a wasteful number, since it uses less digits than its factorization.

66351407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618368.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66351407 is about 8145.6372985789. The cubic root of 66351407 is about 404.8399652219.

The spelling of 66351407 in words is "sixty-six million, three hundred fifty-one thousand, four hundred seven".