18090690552 has 256 divisors, whose sum is σ = 58802112000. Its totient is φ = 5094835200.

The previous prime is 18090690547. The next prime is 18090690559. The reversal of 18090690552 is 25509609081.

18090690552 is a `hidden beast` number, since 1 + 8 + 0 + 9 + 0 + 6 + 90 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18090690498 and 18090690507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090690559) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2388852 + ... + 2396412.

It is an arithmetic number, because the mean of its divisors is an integer number (229695750).

Almost surely, 2^18090690552 is an apocalyptic number.

18090690552 is a gapful number since it is divisible by the number (12) 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 18090690552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29401056000).

18090690552 is an abundant number, since it is smaller than the sum of its proper divisors (40711421448).

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

18090690552 is a wasteful number, since it uses less digits than its factorization.

18090690552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7659 (or 7649 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 18090690552 in words is "eighteen billion, ninety million, six hundred ninety thousand, five hundred fifty-two".