11538970650 has 36 divisors (see below), whose sum is σ = 31001369022. Its totient is φ = 3077058720.

The previous prime is 11538970621. The next prime is 11538970661. The reversal of 11538970650 is 5607983511.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4914150201 + 6624820449 = 70101^2 + 81393^2 .

It is a super-2 number, since 2×11538970650² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11538970596 and 11538970605.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12820629 + ... + 12821528.

Almost surely, 2^11538970650 is an apocalyptic number.

11538970650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11538970650 is an abundant number, since it is smaller than the sum of its proper divisors (19462398372).

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

11538970650 is a wasteful number, since it uses less digits than its factorization.

11538970650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25642175 (or 25642167 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 11538970650 in words is "eleven billion, five hundred thirty-eight million, nine hundred seventy thousand, six hundred fifty".