66254959601 has 4 divisors (see below), whose sum is σ = 66445896432. Its totient is φ = 66064022772.

The previous prime is 66254959597. The next prime is 66254959609. The reversal of 66254959601 is 10695945266.

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 66254959601 - 2² = 66254959597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66254959609) 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, 95467895 + ... + 95468588.

It is an arithmetic number, because the mean of its divisors is an integer number (16611474108).

Almost surely, 2^66254959601 is an apocalyptic number.

It is an amenable number.

66254959601 is a deficient number, since it is larger than the sum of its proper divisors (190936831).

66254959601 is a wasteful number, since it uses less digits than its factorization.

66254959601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190936830.

The product of its (nonzero) digits is 3499200, while the sum is 53.

The spelling of 66254959601 in words is "sixty-six billion, two hundred fifty-four million, nine hundred fifty-nine thousand, six hundred one".