661660606051 has 8 divisors (see below), whose sum is σ = 695698907904. Its totient is φ = 628061508360.

The previous prime is 661660606039. The next prime is 661660606081. The reversal of 661660606051 is 150606066166.

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 661660606051 - 2³³ = 653070671459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661660605989 and 661660606007.

It is not an unprimeable number, because it can be changed into a prime (661660606081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109797951 + ... + 109803976.

It is an arithmetic number, because the mean of its divisors is an integer number (86962363488).

Almost surely, 2^661660606051 is an apocalyptic number.

661660606051 is a deficient number, since it is larger than the sum of its proper divisors (34038301853).

661660606051 is a wasteful number, since it uses less digits than its factorization.

661660606051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219602081.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 661660606051 in words is "six hundred sixty-one billion, six hundred sixty million, six hundred six thousand, fifty-one".