66465401251 has 2 divisors, whose sum is σ = 66465401252. Its totient is φ = 66465401250.

The previous prime is 66465401243. The next prime is 66465401257. The reversal of 66465401251 is 15210456466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66465401251 - 2³ = 66465401243 is a prime.

It is not a weakly prime, because it can be changed into another prime (66465401257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33232700625 + 33232700626.

It is an arithmetic number, because the mean of its divisors is an integer number (33232700626).

Almost surely, 2^66465401251 is an apocalyptic number.

66465401251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66465401251 is an equidigital number, since it uses as much as digits as its factorization.

66465401251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 66465401251 in words is "sixty-six billion, four hundred sixty-five million, four hundred one thousand, two hundred fifty-one".