66412215554 has 16 divisors (see below), whose sum is σ = 108244020480. Its totient is φ = 30443629680.

The previous prime is 66412215539. The next prime is 66412215557. The reversal of 66412215554 is 45551221466.

It is not an unprimeable number, because it can be changed into a prime (66412215557) 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, 28187369 + ... + 28189724.

It is an arithmetic number, because the mean of its divisors is an integer number (6765251280).

Almost surely, 2^66412215554 is an apocalyptic number.

66412215554 is a deficient number, since it is larger than the sum of its proper divisors (41831804926).

66412215554 is a wasteful number, since it uses less digits than its factorization.

66412215554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56377145.

The product of its digits is 288000, while the sum is 41.

The spelling of 66412215554 in words is "sixty-six billion, four hundred twelve million, two hundred fifteen thousand, five hundred fifty-four".