2661645606051 has 8 divisors (see below), whose sum is σ = 3549107194624. Its totient is φ = 1774307210760.

The previous prime is 2661645605939. The next prime is 2661645606071. The reversal of 2661645606051 is 1506065461662.

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

It is not a de Polignac number, because 2661645606051 - 2³⁵ = 2627285867683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661645606071) 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 7 ways as a sum of consecutive naturals, for example, 30747895 + ... + 30834336.

It is an arithmetic number, because the mean of its divisors is an integer number (443638399328).

Almost surely, 2^{2661645606051} is an apocalyptic number.

2661645606051 is a deficient number, since it is larger than the sum of its proper divisors (887461588573).

2661645606051 is a wasteful number, since it uses less digits than its factorization.

2661645606051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61596641.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 2661645606051 in words is "two trillion, six hundred sixty-one billion, six hundred forty-five million, six hundred six thousand, fifty-one".