10042720661 has 8 divisors (see below), whose sum is σ = 10387981824. Its totient is φ = 9698790960.

The previous prime is 10042720657. The next prime is 10042720697. The reversal of 10042720661 is 16602724001.

10042720661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10042720661 - 2² = 10042720657 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 (10042720601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317510 + ... + 347703.

It is an arithmetic number, because the mean of its divisors is an integer number (1298497728).

Almost surely, 2^10042720661 is an apocalyptic number.

It is an amenable number.

10042720661 is a deficient number, since it is larger than the sum of its proper divisors (345261163).

10042720661 is an equidigital number, since it uses as much as digits as its factorization.

10042720661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665731.

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 10042720661 in words is "ten billion, forty-two million, seven hundred twenty thousand, six hundred sixty-one".