661550134 has 16 divisors (see below), whose sum is σ = 1155485088. Its totient is φ = 278171712.

The previous prime is 661550119. The next prime is 661550147. The reversal of 661550134 is 431055166.

It is a junction number, because it is equal to n+sod(n) for n = 661550096 and 661550105.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 445047 + ... + 446530.

It is an arithmetic number, because the mean of its divisors is an integer number (72217818).

Almost surely, 2^661550134 is an apocalyptic number.

661550134 is a deficient number, since it is larger than the sum of its proper divisors (493934954).

661550134 is a wasteful number, since it uses less digits than its factorization.

661550134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891639.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 661550134 is about 25720.6169055099. The cubic root of 661550134 is about 871.3398713957.

The spelling of 661550134 in words is "six hundred sixty-one million, five hundred fifty thousand, one hundred thirty-four".