1661060553851 has 8 divisors (see below), whose sum is σ = 1692669318480. Its totient is φ = 1629461715232.

The previous prime is 1661060553839. The next prime is 1661060553931. The reversal of 1661060553851 is 1583550601661.

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-1661060553851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661060553796 and 1661060553805.

It is not an unprimeable number, because it can be changed into a prime (1661060553751) 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, 2143196 + ... + 2813433.

It is an arithmetic number, because the mean of its divisors is an integer number (211583664810).

Almost surely, 2^{1661060553851} is an apocalyptic number.

1661060553851 is a deficient number, since it is larger than the sum of its proper divisors (31608764629).

1661060553851 is an equidigital number, since it uses as much as digits as its factorization.

1661060553851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963005.

The product of its (nonzero) digits is 648000, while the sum is 47.

The spelling of 1661060553851 in words is "one trillion, six hundred sixty-one billion, sixty million, five hundred fifty-three thousand, eight hundred fifty-one".