1620621103061 has 4 divisors (see below), whose sum is σ = 1664421673452. Its totient is φ = 1576820532672.

The previous prime is 1620621103043. The next prime is 1620621103063. The reversal of 1620621103061 is 1603011260261.

It is a happy number.

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 1545966470161 + 74654632900 = 1243369^2 + 273230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620621103061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620621103063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21900285140 + ... + 21900285213.

It is an arithmetic number, because the mean of its divisors is an integer number (416105418363).

Almost surely, 2^{1620621103061} is an apocalyptic number.

It is an amenable number.

1620621103061 is a deficient number, since it is larger than the sum of its proper divisors (43800570391).

1620621103061 is an equidigital number, since it uses as much as digits as its factorization.

1620621103061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43800570390.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 1620621103061 in words is "one trillion, six hundred twenty billion, six hundred twenty-one million, one hundred three thousand, sixty-one".