1016721056641 has 8 divisors (see below), whose sum is σ = 1019070449280. Its totient is φ = 1014372326352.

The previous prime is 1016721056623. The next prime is 1016721056669. The reversal of 1016721056641 is 1466501276101.

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

It is a cyclic number.

It is not a de Polignac number, because 1016721056641 - 2¹⁹ = 1016720532353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1016721056594 and 1016721056603.

It is not an unprimeable number, because it can be changed into a prime (1016721056041) 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, 2976711 + ... + 3300643.

It is an arithmetic number, because the mean of its divisors is an integer number (127383806160).

Almost surely, 2^{1016721056641} is an apocalyptic number.

It is an amenable number.

1016721056641 is a deficient number, since it is larger than the sum of its proper divisors (2349392639).

1016721056641 is an equidigital number, since it uses as much as digits as its factorization.

1016721056641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331175.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 1016721056641 in words is "one trillion, sixteen billion, seven hundred twenty-one million, fifty-six thousand, six hundred forty-one".