1616405821604 has 12 divisors (see below), whose sum is σ = 3232811643264. Its totient is φ = 692745352104.

The previous prime is 1616405821601. The next prime is 1616405821637. The reversal of 1616405821604 is 4061285046161.

It is a happy number.

1616405821604 is an admirable number.

It is a super-2 number, since 2×1616405821604² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1616405821601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28864389644 + ... + 28864389699.

It is an arithmetic number, because the mean of its divisors is an integer number (269400970272).

Almost surely, 2^{1616405821604} is an apocalyptic number.

1616405821604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1616405821604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1616405821604 is a wasteful number, since it uses less digits than its factorization.

1616405821604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57728779354 (or 57728779352 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 1616405821604 in words is "one trillion, six hundred sixteen billion, four hundred five million, eight hundred twenty-one thousand, six hundred four".