66434415051 has 4 divisors (see below), whose sum is σ = 88579220072. Its totient is φ = 44289610032.

The previous prime is 66434415049. The next prime is 66434415083. The reversal of 66434415051 is 15051443466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66434415051 - 2¹ = 66434415049 is a prime.

It is a super-4 number, since 4×66434415051⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66434915051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11072402506 + ... + 11072402511.

It is an arithmetic number, because the mean of its divisors is an integer number (22144805018).

Almost surely, 2^66434415051 is an apocalyptic number.

66434415051 is a deficient number, since it is larger than the sum of its proper divisors (22144805021).

66434415051 is a wasteful number, since it uses less digits than its factorization.

66434415051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22144805020.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 66434415051 in words is "sixty-six billion, four hundred thirty-four million, four hundred fifteen thousand, fifty-one".