66717087501 has 4 divisors (see below), whose sum is σ = 88956116672. Its totient is φ = 44478058332.

The previous prime is 66717087497. The next prime is 66717087539. The reversal of 66717087501 is 10578071766.

It is a happy number.

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.

It is not a de Polignac number, because 66717087501 - 2² = 66717087497 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 (66717087601) 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, 11119514581 + ... + 11119514586.

It is an arithmetic number, because the mean of its divisors is an integer number (22239029168).

Almost surely, 2^66717087501 is an apocalyptic number.

It is an amenable number.

66717087501 is a deficient number, since it is larger than the sum of its proper divisors (22239029171).

66717087501 is a wasteful number, since it uses less digits than its factorization.

66717087501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22239029170.

The product of its (nonzero) digits is 493920, while the sum is 48.

The spelling of 66717087501 in words is "sixty-six billion, seven hundred seventeen million, eighty-seven thousand, five hundred one".