278381660066 has 8 divisors (see below), whose sum is σ = 417586083024. Its totient is φ = 139186299060.

The previous prime is 278381660057. The next prime is 278381660077. The reversal of 278381660066 is 660066183872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×278381660066² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188160 + ... + 2311883.

It is an arithmetic number, because the mean of its divisors is an integer number (52198260378).

Almost surely, 2^278381660066 is an apocalyptic number.

278381660066 is a deficient number, since it is larger than the sum of its proper divisors (139204422958).

278381660066 is a wasteful number, since it uses less digits than its factorization.

278381660066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4530976.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 278381660066 in words is "two hundred seventy-eight billion, three hundred eighty-one million, six hundred sixty thousand, sixty-six".