1616021400261 has 8 divisors (see below), whose sum is σ = 2165859424960. Its totient is φ = 1071765487872.

The previous prime is 1616021400241. The next prime is 1616021400293. The reversal of 1616021400261 is 1620041206161.

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

It is not a de Polignac number, because 1616021400261 - 2³⁰ = 1614947658437 is a prime.

It is a super-2 number, since 2×1616021400261² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616021400241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395527401 + ... + 1395528558.

It is an arithmetic number, because the mean of its divisors is an integer number (270732428120).

Almost surely, 2^{1616021400261} is an apocalyptic number.

It is an amenable number.

1616021400261 is a deficient number, since it is larger than the sum of its proper divisors (549838024699).

1616021400261 is a wasteful number, since it uses less digits than its factorization.

1616021400261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791056155.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 1616021400261 in words is "one trillion, six hundred sixteen billion, twenty-one million, four hundred thousand, two hundred sixty-one".