398546540665 has 16 divisors (see below), whose sum is σ = 588622583808. Its totient is φ = 252266821056.

The previous prime is 398546540663. The next prime is 398546540671. The reversal of 398546540665 is 566045645893.

It is a cyclic number.

It is not a de Polignac number, because 398546540665 - 2¹ = 398546540663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398546540663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 437962777 + ... + 437963686.

It is an arithmetic number, because the mean of its divisors is an integer number (36788911488).

Almost surely, 2^398546540665 is an apocalyptic number.

398546540665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

398546540665 is a deficient number, since it is larger than the sum of its proper divisors (190076043143).

398546540665 is a wasteful number, since it uses less digits than its factorization.

398546540665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875926488.

The product of its (nonzero) digits is 93312000, while the sum is 61.

The spelling of 398546540665 in words is "three hundred ninety-eight billion, five hundred forty-six million, five hundred forty thousand, six hundred sixty-five".