1620716621011 has 4 divisors (see below), whose sum is σ = 1651296179952. Its totient is φ = 1590137062072.

The previous prime is 1620716621009. The next prime is 1620716621039. The reversal of 1620716621011 is 1101266170261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620716621011 - 2¹ = 1620716621009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620716621611) 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, 15289779391 + ... + 15289779496.

It is an arithmetic number, because the mean of its divisors is an integer number (412824044988).

Almost surely, 2^{1620716621011} is an apocalyptic number.

1620716621011 is a deficient number, since it is larger than the sum of its proper divisors (30579558941).

1620716621011 is an equidigital number, since it uses as much as digits as its factorization.

1620716621011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30579558940.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 1620716621011 in words is "one trillion, six hundred twenty billion, seven hundred sixteen million, six hundred twenty-one thousand, eleven".