661541534 has 8 divisors (see below), whose sum is σ = 992513928. Its totient is φ = 330703560.

The previous prime is 661541527. The next prime is 661541561. The reversal of 661541534 is 435145166.

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

It is a junction number, because it is equal to n+sod(n) for n = 661541494 and 661541503.

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 3 ways as a sum of consecutive naturals, for example, 20237 + ... + 41624.

It is an arithmetic number, because the mean of its divisors is an integer number (124064241).

Almost surely, 2^661541534 is an apocalyptic number.

661541534 is a deficient number, since it is larger than the sum of its proper divisors (330972394).

661541534 is a wasteful number, since it uses less digits than its factorization.

661541534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67210.

The product of its digits is 43200, while the sum is 35.

The square root of 661541534 is about 25720.4497239065. The cubic root of 661541534 is about 871.3360956398.

The spelling of 661541534 in words is "six hundred sixty-one million, five hundred forty-one thousand, five hundred thirty-four".