66438701 has 8 divisors (see below), whose sum is σ = 76004544. Its totient is φ = 56891520.

The previous prime is 66438583. The next prime is 66438707. The reversal of 66438701 is 10783466.

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

It is not a de Polignac number, because 66438701 - 2¹⁰ = 66437677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66438707) 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, 4061 + ... + 12221.

It is an arithmetic number, because the mean of its divisors is an integer number (9500568).

Almost surely, 2^66438701 is an apocalyptic number.

It is an amenable number.

66438701 is a deficient number, since it is larger than the sum of its proper divisors (9565843).

66438701 is a wasteful number, since it uses less digits than its factorization.

66438701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 66438701 is about 8150.9938657810. The cubic root of 66438701 is about 405.0174274876.

The spelling of 66438701 in words is "sixty-six million, four hundred thirty-eight thousand, seven hundred one".