1620611235636 has 24 divisors (see below), whose sum is σ = 3781454883360. Its totient is φ = 540199649952.

The previous prime is 1620611235613. The next prime is 1620611235643. The reversal of 1620611235636 is 6365321160261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432330 + ... + 2300606.

It is an arithmetic number, because the mean of its divisors is an integer number (157560620140).

Almost surely, 2^{1620611235636} is an apocalyptic number.

It is an amenable number.

1620611235636 is an abundant number, since it is smaller than the sum of its proper divisors (2160843647724).

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

1620611235636 is a wasteful number, since it uses less digits than its factorization.

1620611235636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023823 (or 1023821 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

Adding to 1620611235636 its reverse (6365321160261), we get a palindrome (7985932395897).

The spelling of 1620611235636 in words is "one trillion, six hundred twenty billion, six hundred eleven million, two hundred thirty-five thousand, six hundred thirty-six".