398933655551 has 8 divisors (see below), whose sum is σ = 404803363104. Its totient is φ = 393070918240.

The previous prime is 398933655511. The next prime is 398933655563. The reversal of 398933655551 is 155556339893.

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 398933655551 - 2³⁴ = 381753786367 is a prime.

It is a super-2 number, since 2×398933655551² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398933655511) 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, 1627196 + ... + 1856241.

It is an arithmetic number, because the mean of its divisors is an integer number (50600420388).

Almost surely, 2^398933655551 is an apocalyptic number.

398933655551 is a deficient number, since it is larger than the sum of its proper divisors (5869707553).

398933655551 is a wasteful number, since it uses less digits than its factorization.

398933655551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485121.

The product of its digits is 65610000, while the sum is 62.

The spelling of 398933655551 in words is "three hundred ninety-eight billion, nine hundred thirty-three million, six hundred fifty-five thousand, five hundred fifty-one".