18061265880 has 384 divisors, whose sum is σ = 70950297600. Its totient is φ = 3896985600.

The previous prime is 18061265861. The next prime is 18061265899. The reversal of 18061265880 is 8856216081.

18061265880 is a `hidden beast` number, since 1 + 8 + 0 + 61 + 2 + 6 + 588 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18061265861) and next prime (18061265899).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3200101 + ... + 3205739.

It is an arithmetic number, because the mean of its divisors is an integer number (184766400).

Almost surely, 2^18061265880 is an apocalyptic number.

18061265880 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 18061265880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35475148800).

18061265880 is an abundant number, since it is smaller than the sum of its proper divisors (52889031720).

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

18061265880 is a wasteful number, since it uses less digits than its factorization.

18061265880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5735 (or 5728 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 18061265880 in words is "eighteen billion, sixty-one million, two hundred sixty-five thousand, eight hundred eighty".