1620415322261 has 8 divisors (see below), whose sum is σ = 1648141893600. Its totient is φ = 1592697481200.

The previous prime is 1620415322213. The next prime is 1620415322287. The reversal of 1620415322261 is 1622235140261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620415322261 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 (1620415328261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1807631 + ... + 2551148.

It is an arithmetic number, because the mean of its divisors is an integer number (206017736700).

Almost surely, 2^{1620415322261} is an apocalyptic number.

It is an amenable number.

1620415322261 is a deficient number, since it is larger than the sum of its proper divisors (27726571339).

1620415322261 is an equidigital number, since it uses as much as digits as its factorization.

1620415322261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4365139.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 1620415322261 in words is "one trillion, six hundred twenty billion, four hundred fifteen million, three hundred twenty-two thousand, two hundred sixty-one".