647661166746 has 48 divisors (see below), whose sum is σ = 1462264763232. Its totient is φ = 190956601440.

The previous prime is 647661166739. The next prime is 647661166753.

647661166746 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (647661166739) and next prime (647661166753).

It is a self number, because there is not a number n which added to its sum of digits gives 647661166746.

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 23 ways as a sum of consecutive naturals, for example, 12028480 + ... + 12082203.

It is an arithmetic number, because the mean of its divisors is an integer number (30463849234).

Almost surely, 2^647661166746 is an apocalyptic number.

647661166746 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

647661166746 is an abundant number, since it is smaller than the sum of its proper divisors (814603596486).

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

647661166746 is a wasteful number, since it uses less digits than its factorization.

647661166746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24110747 (or 24110736 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 60.

The spelling of 647661166746 in words is "six hundred forty-seven billion, six hundred sixty-one million, one hundred sixty-six thousand, seven hundred forty-six".