18649146780 has 504 divisors, whose sum is σ = 66735939312. Its totient is φ = 4375166400.

The previous prime is 18649146767. The next prime is 18649146781. The reversal of 18649146780 is 8764194681.

18649146780 is a `hidden beast` number, since 1 + 86 + 491 + 4 + 6 + 78 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18649146781) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 601585365 + ... + 601585395.

It is an arithmetic number, because the mean of its divisors is an integer number (132412578).

Almost surely, 2^18649146780 is an apocalyptic number.

18649146780 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 18649146780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33367969656).

18649146780 is an abundant number, since it is smaller than the sum of its proper divisors (48086792532).

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

18649146780 is an equidigital number, since it uses as much as digits as its factorization.

18649146780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 18649146780 in words is "eighteen billion, six hundred forty-nine million, one hundred forty-six thousand, seven hundred eighty".