11155551000 has 256 divisors, whose sum is σ = 38356830720. Its totient is φ = 2676800000.

The previous prime is 11155550983. The next prime is 11155551013. The reversal of 11155551000 is 15555111.

It is a super-2 number, since 2×11155551000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3331327 + ... + 3334673.

It is an arithmetic number, because the mean of its divisors is an integer number (149831370).

Almost surely, 2^11155551000 is an apocalyptic number.

11155551000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11155551000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19178415360).

11155551000 is an abundant number, since it is smaller than the sum of its proper divisors (27201279720).

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

11155551000 is a wasteful number, since it uses less digits than its factorization.

11155551000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483 (or 3469 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 24.

The spelling of 11155551000 in words is "eleven billion, one hundred fifty-five million, five hundred fifty-one thousand".