398215661761 has 8 divisors (see below), whose sum is σ = 409014336384. Its totient is φ = 387418886640.

The previous prime is 398215661743. The next prime is 398215661801. The reversal of 398215661761 is 167166512893.

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

It is not a de Polignac number, because 398215661761 - 2¹¹ = 398215659713 is a prime.

It is a super-2 number, since 2×398215661761² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398215664761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44695 + ... + 893548.

It is an arithmetic number, because the mean of its divisors is an integer number (51126792048).

Almost surely, 2^398215661761 is an apocalyptic number.

It is an amenable number.

398215661761 is a deficient number, since it is larger than the sum of its proper divisors (10798674623).

398215661761 is a wasteful number, since it uses less digits than its factorization.

398215661761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949751.

The product of its digits is 3265920, while the sum is 55.

The spelling of 398215661761 in words is "three hundred ninety-eight billion, two hundred fifteen million, six hundred sixty-one thousand, seven hundred sixty-one".