2101753051661 has 4 divisors (see below), whose sum is σ = 2137375984800. Its totient is φ = 2066130118524.

The previous prime is 2101753051631. The next prime is 2101753051679. The reversal of 2101753051661 is 1661503571012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101753051661 - 2²² = 2101748857357 is a prime.

It is a super-2 number, since 2×2101753051661² (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 (2101753051631) 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, 17811466481 + ... + 17811466598.

It is an arithmetic number, because the mean of its divisors is an integer number (534343996200).

Almost surely, 2^{2101753051661} is an apocalyptic number.

It is an amenable number.

2101753051661 is a deficient number, since it is larger than the sum of its proper divisors (35622933139).

2101753051661 is an equidigital number, since it uses as much as digits as its factorization.

2101753051661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35622933138.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 2101753051661 in words is "two trillion, one hundred one billion, seven hundred fifty-three million, fifty-one thousand, six hundred sixty-one".