66451403415 has 32 divisors (see below), whose sum is σ = 111997486080. Its totient is φ = 33551646336.

The previous prime is 66451403401. The next prime is 66451403441. The reversal of 66451403415 is 51430415466.

It is not a de Polignac number, because 66451403415 - 2¹⁷ = 66451272343 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323629 + ... + 487481.

It is an arithmetic number, because the mean of its divisors is an integer number (3499921440).

Almost surely, 2^66451403415 is an apocalyptic number.

66451403415 is a deficient number, since it is larger than the sum of its proper divisors (45546082665).

66451403415 is a wasteful number, since it uses less digits than its factorization.

66451403415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165303.

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

The spelling of 66451403415 in words is "sixty-six billion, four hundred fifty-one million, four hundred three thousand, four hundred fifteen".