18634577472 has 336 divisors, whose sum is σ = 67034298240. Its totient is φ = 5010481152.

The previous prime is 18634577471. The next prime is 18634577491. The reversal of 18634577472 is 27477543681.

18634577472 is a `hidden beast` number, since 1 + 8 + 63 + 4 + 577 + 4 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

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 (18634577471) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1845654 + ... + 1855722.

It is an arithmetic number, because the mean of its divisors is an integer number (199506840).

Almost surely, 2^18634577472 is an apocalyptic number.

18634577472 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 18634577472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33517149120).

18634577472 is an abundant number, since it is smaller than the sum of its proper divisors (48399720768).

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

18634577472 is a wasteful number, since it uses less digits than its factorization.

18634577472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120 (or 10098 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 54.

The spelling of 18634577472 in words is "eighteen billion, six hundred thirty-four million, five hundred seventy-seven thousand, four hundred seventy-two".