66231554401 has 8 divisors (see below), whose sum is σ = 67862098304. Its totient is φ = 64605114000.

The previous prime is 66231554399. The next prime is 66231554437. The reversal of 66231554401 is 10445513266.

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

It is a cyclic number.

It is not a de Polignac number, because 66231554401 - 2¹ = 66231554399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66231558401) 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, 993186 + ... + 1057771.

It is an arithmetic number, because the mean of its divisors is an integer number (8482762288).

Almost surely, 2^66231554401 is an apocalyptic number.

It is an amenable number.

66231554401 is a deficient number, since it is larger than the sum of its proper divisors (1630543903).

66231554401 is a wasteful number, since it uses less digits than its factorization.

66231554401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051751.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 66231554401 in words is "sixty-six billion, two hundred thirty-one million, five hundred fifty-four thousand, four hundred one".