618446681 has 8 divisors (see below), whose sum is σ = 628790400. Its totient is φ = 608166000.

The previous prime is 618446659. The next prime is 618446687. The reversal of 618446681 is 186644816.

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

It is a cyclic number.

It is not a de Polignac number, because 618446681 - 2⁶ = 618446617 is a prime.

It is a super-2 number, since 2×618446681² = 764952594479831522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618446687) 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, 4235 + ... + 35423.

It is an arithmetic number, because the mean of its divisors is an integer number (78598800).

Almost surely, 2^618446681 is an apocalyptic number.

It is an amenable number.

618446681 is a deficient number, since it is larger than the sum of its proper divisors (10343719).

618446681 is a wasteful number, since it uses less digits than its factorization.

618446681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31519.

The product of its digits is 221184, while the sum is 44.

The square root of 618446681 is about 24868.5882389813. The cubic root of 618446681 is about 851.9891963224.

The spelling of 618446681 in words is "six hundred eighteen million, four hundred forty-six thousand, six hundred eighty-one".