220401522450 has 126 divisors (see below), whose sum is σ = 614889133509. Its totient is φ = 58749837840.

The previous prime is 220401522409. The next prime is 220401522457. The reversal of 220401522450 is 54225104022.

220401522450 is a `hidden beast` number, since 2 + 20 + 40 + 152 + 2 + 450 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 215993492001 + 4408030449 = 464751^2 + 66393^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=331965.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (220401522457) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 89629321 + ... + 89631779.

Almost surely, 2^220401522450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220401522450

220401522450 is an abundant number, since it is smaller than the sum of its proper divisors (394487611059).

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

220401522450 is an frugal number, since it uses more digits than its factorization.

220401522450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4948 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 220401522450 its reverse (54225104022), we get a palindrome (274626626472).

The spelling of 220401522450 in words is "two hundred twenty billion, four hundred one million, five hundred twenty-two thousand, four hundred fifty".