1620624401349 has 4 divisors (see below), whose sum is σ = 2160832535136. Its totient is φ = 1080416267564.

The previous prime is 1620624401323. The next prime is 1620624401377. The reversal of 1620624401349 is 9431044260261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1620624401349 - 2³⁹ = 1070868587461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1620624401349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620624401309) 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, 270104066889 + ... + 270104066894.

It is an arithmetic number, because the mean of its divisors is an integer number (540208133784).

Almost surely, 2^{1620624401349} is an apocalyptic number.

It is an amenable number.

1620624401349 is a deficient number, since it is larger than the sum of its proper divisors (540208133787).

1620624401349 is an equidigital number, since it uses as much as digits as its factorization.

1620624401349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540208133786.

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 1620624401349 in words is "one trillion, six hundred twenty billion, six hundred twenty-four million, four hundred one thousand, three hundred forty-nine".