661913534 has 8 divisors (see below), whose sum is σ = 1015960440. Its totient is φ = 323260056.

The previous prime is 661913531. The next prime is 661913537. The reversal of 661913534 is 435319166.

It is an interprime number because it is at equal distance from previous prime (661913531) and next prime (661913537).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661913531) 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 3 ways as a sum of consecutive naturals, for example, 3848249 + ... + 3848420.

It is an arithmetic number, because the mean of its divisors is an integer number (126995055).

Almost surely, 2^661913534 is an apocalyptic number.

661913534 is a deficient number, since it is larger than the sum of its proper divisors (354046906).

661913534 is a wasteful number, since it uses less digits than its factorization.

661913534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7696714.

The product of its digits is 58320, while the sum is 38.

The square root of 661913534 is about 25727.6803074043. The cubic root of 661913534 is about 871.4993891360.

The spelling of 661913534 in words is "six hundred sixty-one million, nine hundred thirteen thousand, five hundred thirty-four".