290991889855 has 8 divisors (see below), whose sum is σ = 349202585664. Its totient is φ = 232785300000.

The previous prime is 290991889709. The next prime is 290991889861. The reversal of 290991889855 is 558988199092.

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

It is not a de Polignac number, because 290991889855 - 2²⁹ = 290455018943 is a prime.

It is a super-2 number, since 2×290991889855² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868356 + ... + 1155865.

It is an arithmetic number, because the mean of its divisors is an integer number (43650323208).

Almost surely, 2^290991889855 is an apocalyptic number.

290991889855 is a deficient number, since it is larger than the sum of its proper divisors (58210695809).

290991889855 is a wasteful number, since it uses less digits than its factorization.

290991889855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052977.

The product of its (nonzero) digits is 167961600, while the sum is 73.

The spelling of 290991889855 in words is "two hundred ninety billion, nine hundred ninety-one million, eight hundred eighty-nine thousand, eight hundred fifty-five".