66490214428 has 24 divisors (see below), whose sum is σ = 134402680944. Its totient is φ = 28445011200.

The previous prime is 66490214423. The next prime is 66490214467. The reversal of 66490214428 is 82441209466.

It is a super-2 number, since 2×66490214428² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66490214423) 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, 44444583 + ... + 44446078.

It is an arithmetic number, because the mean of its divisors is an integer number (5600111706).

Almost surely, 2^66490214428 is an apocalyptic number.

66490214428 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66490214428 is an abundant number, since it is smaller than the sum of its proper divisors (67912466516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66490214428 is a wasteful number, since it uses less digits than its factorization.

66490214428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88890693 (or 88890691 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 66490214428 in words is "sixty-six billion, four hundred ninety million, two hundred fourteen thousand, four hundred twenty-eight".