18687253050 has 72 divisors (see below), whose sum is σ = 50261587740. Its totient is φ = 4977792000.

The previous prime is 18687253033. The next prime is 18687253087. The reversal of 18687253050 is 5035278681.

18687253050 is a `hidden beast` number, since 1 + 8 + 68 + 7 + 2 + 530 + 50 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 88566921 + 18598686129 = 9411^2 + 136377^2 .

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 = 18687252987 and 18687253005.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 395700 + ... + 440400.

Almost surely, 2^18687253050 is an apocalyptic number.

18687253050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18687253050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25130793870).

18687253050 is an abundant number, since it is smaller than the sum of its proper divisors (31574334690).

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

18687253050 is a wasteful number, since it uses less digits than its factorization.

18687253050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45648 (or 45640 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 18687253050 in words is "eighteen billion, six hundred eighty-seven million, two hundred fifty-three thousand, fifty".