66219054431 has 2 divisors, whose sum is σ = 66219054432. Its totient is φ = 66219054430.

The previous prime is 66219054371. The next prime is 66219054457. The reversal of 66219054431 is 13445091266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66219054431 - 2¹⁸ = 66218792287 is a prime.

It is a super-2 number, since 2×66219054431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66219054481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33109527215 + 33109527216.

It is an arithmetic number, because the mean of its divisors is an integer number (33109527216).

Almost surely, 2^66219054431 is an apocalyptic number.

66219054431 is a deficient number, since it is larger than the sum of its proper divisors (1).

66219054431 is an equidigital number, since it uses as much as digits as its factorization.

66219054431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 66219054431 in words is "sixty-six billion, two hundred nineteen million, fifty-four thousand, four hundred thirty-one".