66787601 has 4 divisors (see below), whose sum is σ = 66846192. Its totient is φ = 66729012.

The previous prime is 66787597. The next prime is 66787613. The reversal of 66787601 is 10678766.

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 a cyclic number.

It is not a de Polignac number, because 66787601 - 2² = 66787597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66787631) 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, 27551 + ... + 29876.

It is an arithmetic number, because the mean of its divisors is an integer number (16711548).

Almost surely, 2^66787601 is an apocalyptic number.

It is an amenable number.

66787601 is a deficient number, since it is larger than the sum of its proper divisors (58591).

66787601 is a wasteful number, since it uses less digits than its factorization.

66787601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58590.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 66787601 is about 8172.3681390402. The cubic root of 66787601 is about 405.7251672805.

The spelling of 66787601 in words is "sixty-six million, seven hundred eighty-seven thousand, six hundred one".