66954087251 has 8 divisors (see below), whose sum is σ = 70493693520. Its totient is φ = 63416051712.

The previous prime is 66954087247. The next prime is 66954087253. The reversal of 66954087251 is 15278045966.

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 66954087251 - 2² = 66954087247 is a prime.

It is a super-2 number, since 2×66954087251² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66954087193 and 66954087202.

It is not an unprimeable number, because it can be changed into a prime (66954087253) 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, 304670 + ... + 476163.

It is an arithmetic number, because the mean of its divisors is an integer number (8811711690).

Almost surely, 2^66954087251 is an apocalyptic number.

66954087251 is a deficient number, since it is larger than the sum of its proper divisors (3539606269).

66954087251 is a wasteful number, since it uses less digits than its factorization.

66954087251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785365.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 66954087251 in words is "sixty-six billion, nine hundred fifty-four million, eighty-seven thousand, two hundred fifty-one".