6620442400404 has 54 divisors (see below), whose sum is σ = 19467253253994. Its totient is φ = 1891554971040.

The previous prime is 6620442400393. The next prime is 6620442400409. The reversal of 6620442400404 is 4040042440266.

6620442400404 is a `hidden beast` number, since 6 + 6 + 2 + 0 + 4 + 4 + 240 + 0 + 404 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3671048336004 + 2949394064400 = 1915998^2 + 1717380^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620442400409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1876540867 + ... + 1876544394.

Almost surely, 2^{6620442400404} is an apocalyptic number.

It is an amenable number.

6620442400404 is an abundant number, since it is smaller than the sum of its proper divisors (12846810853590).

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

6620442400404 is a wasteful number, since it uses less digits than its factorization.

6620442400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753085285 (or 3753085273 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 36.

The spelling of 6620442400404 in words is "six trillion, six hundred twenty billion, four hundred forty-two million, four hundred thousand, four hundred four".