661359051 has 6 divisors (see below), whose sum is σ = 955296420. Its totient is φ = 440906028.

The previous prime is 661359047. The next prime is 661359067. The reversal of 661359051 is 150953166.

661359051 is a `hidden beast` number, since 6 + 6 + 13 + 590 + 51 = 666.

It is not a de Polignac number, because 661359051 - 2² = 661359047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661358997 and 661359015.

It is not an unprimeable number, because it can be changed into a prime (661359001) 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 5 ways as a sum of consecutive naturals, for example, 36742161 + ... + 36742178.

It is an arithmetic number, because the mean of its divisors is an integer number (159216070).

Almost surely, 2^661359051 is an apocalyptic number.

661359051 is a deficient number, since it is larger than the sum of its proper divisors (293937369).

661359051 is a wasteful number, since it uses less digits than its factorization.

661359051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73484345 (or 73484342 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 661359051 is about 25716.9020490416. The cubic root of 661359051 is about 871.2559703370.

The spelling of 661359051 in words is "six hundred sixty-one million, three hundred fifty-nine thousand, fifty-one".