10011550820 has 12 divisors (see below), whose sum is σ = 21024256764. Its totient is φ = 4004620320.

The previous prime is 10011550819. The next prime is 10011550823. The reversal of 10011550820 is 2805511001.

It can be written as a sum of positive squares in 2 ways, for example, as 4029456484 + 5982094336 = 63478^2 + 77344^2 .

It is a super-2 number, since 2×10011550820² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10011550823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250288751 + ... + 250288790.

It is an arithmetic number, because the mean of its divisors is an integer number (1752021397).

Almost surely, 2^10011550820 is an apocalyptic number.

10011550820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10011550820 is an abundant number, since it is smaller than the sum of its proper divisors (11012705944).

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

10011550820 is a wasteful number, since it uses less digits than its factorization.

10011550820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500577550 (or 500577548 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The spelling of 10011550820 in words is "ten billion, eleven million, five hundred fifty thousand, eight hundred twenty".