1098686655 has 144 divisors (see below), whose sum is σ = 2262693888. Its totient is φ = 491356800.

The previous prime is 1098686639. The next prime is 1098686657. The reversal of 1098686655 is 5566868901.

It is a happy number.

It is not a de Polignac number, because 1098686655 - 2⁴ = 1098686639 is a prime.

It is a super-2 number, since 2×1098686655² = 2414224731750178050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098686657) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3882144 + ... + 3882426.

It is an arithmetic number, because the mean of its divisors is an integer number (15713152).

Almost surely, 2^1098686655 is an apocalyptic number.

1098686655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1098686655 is an abundant number, since it is smaller than the sum of its proper divisors (1164007233).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1098686655 is a wasteful number, since it uses less digits than its factorization.

1098686655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The square root of 1098686655 is about 33146.4425693015. The cubic root of 1098686655 is about 1031.8691215629.

The spelling of 1098686655 in words is "one billion, ninety-eight million, six hundred eighty-six thousand, six hundred fifty-five".