66764701 has 4 divisors (see below), whose sum is σ = 66782304. Its totient is φ = 66747100.

The previous prime is 66764693. The next prime is 66764713. The reversal of 66764701 is 10746766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10746766 = 2 ⋅5373383.

It is a cyclic number.

It is not a de Polignac number, because 66764701 - 2³ = 66764693 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 (66714701) 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, 505 + ... + 11566.

It is an arithmetic number, because the mean of its divisors is an integer number (16695576).

Almost surely, 2^66764701 is an apocalyptic number.

It is an amenable number.

66764701 is a deficient number, since it is larger than the sum of its proper divisors (17603).

66764701 is a wasteful number, since it uses less digits than its factorization.

66764701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17602.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 66764701 is about 8170.9669562421. The cubic root of 66764701 is about 405.6787905663.

The spelling of 66764701 in words is "sixty-six million, seven hundred sixty-four thousand, seven hundred one".