671561766242 has 32 divisors (see below), whose sum is σ = 1120020971520. Its totient is φ = 300687402960.

The previous prime is 671561766233. The next prime is 671561766301. The reversal of 671561766242 is 242667165176.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6578258 + ... + 6679565.

It is an arithmetic number, because the mean of its divisors is an integer number (35000655360).

Almost surely, 2^671561766242 is an apocalyptic number.

671561766242 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

671561766242 is a deficient number, since it is larger than the sum of its proper divisors (448459205278).

671561766242 is a wasteful number, since it uses less digits than its factorization.

671561766242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13257918.

The product of its digits is 5080320, while the sum is 53.

The spelling of 671561766242 in words is "six hundred seventy-one billion, five hundred sixty-one million, seven hundred sixty-six thousand, two hundred forty-two".