618416420625 has 50 divisors (see below), whose sum is σ = 1154389628634. Its totient is φ = 329822064000.

The previous prime is 618416420621. The next prime is 618416420627. The reversal of 618416420625 is 526024614816.

It is a happy number.

618416420625 is a `hidden beast` number, since 6 + 1 + 8 + 4 + 16 + 4 + 2 + 0 + 625 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 245105196561 + 373311224064 = 495081^2 + 610992^2 .

It is not a de Polignac number, because 618416420625 - 2² = 618416420621 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (618416420621) by changing a digit.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 6057192 + ... + 6158441.

Almost surely, 2^618416420625 is an apocalyptic number.

It is an amenable number.

618416420625 is a deficient number, since it is larger than the sum of its proper divisors (535973208009).

618416420625 is an equidigital number, since it uses as much as digits as its factorization.

618416420625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12215665 (or 12215641 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

It can be divided in two parts, 6184 and 16420625, that added together give a square (16426809 = 4053²).

The spelling of 618416420625 in words is "six hundred eighteen billion, four hundred sixteen million, four hundred twenty thousand, six hundred twenty-five".