66294251655 has 8 divisors (see below), whose sum is σ = 106070802672. Its totient is φ = 35356934208.

The previous prime is 66294251627. The next prime is 66294251677. The reversal of 66294251655 is 55615249266.

66294251655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66294251655 - 2¹² = 66294247559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66294251598 and 66294251607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2209808374 + ... + 2209808403.

It is an arithmetic number, because the mean of its divisors is an integer number (13258850334).

Almost surely, 2^66294251655 is an apocalyptic number.

66294251655 is a deficient number, since it is larger than the sum of its proper divisors (39776551017).

66294251655 is a wasteful number, since it uses less digits than its factorization.

66294251655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4419616785.

The product of its digits is 3888000, while the sum is 51.

The spelling of 66294251655 in words is "sixty-six billion, two hundred ninety-four million, two hundred fifty-one thousand, six hundred fifty-five".