1616547253421 has 4 divisors (see below), whose sum is σ = 1625891457372. Its totient is φ = 1607203049472.

The previous prime is 1616547253367. The next prime is 1616547253427. The reversal of 1616547253421 is 1243527456161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 756265033225 + 860282220196 = 869635^2 + 927514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616547253421 - 2¹⁴ = 1616547237037 is a prime.

It is a super-2 number, since 2×1616547253421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616547253427) 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, 4672101716 + ... + 4672102061.

It is an arithmetic number, because the mean of its divisors is an integer number (406472864343).

Almost surely, 2^{1616547253421} is an apocalyptic number.

It is an amenable number.

1616547253421 is a deficient number, since it is larger than the sum of its proper divisors (9344203951).

1616547253421 is an equidigital number, since it uses as much as digits as its factorization.

1616547253421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344203950.

The product of its digits is 1209600, while the sum is 47.

The spelling of 1616547253421 in words is "one trillion, six hundred sixteen billion, five hundred forty-seven million, two hundred fifty-three thousand, four hundred twenty-one".