61659564 has 48 divisors (see below), whose sum is σ = 148877568. Its totient is φ = 19850688.

The previous prime is 61659509. The next prime is 61659571. The reversal of 61659564 is 46595616.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41889 + ... + 43335.

It is an arithmetic number, because the mean of its divisors is an integer number (3101616).

Almost surely, 2^61659564 is an apocalyptic number.

It is an amenable number.

61659564 is an abundant number, since it is smaller than the sum of its proper divisors (87218004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61659564 is a wasteful number, since it uses less digits than its factorization.

61659564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574 (or 1572 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 61659564 is about 7852.3604094565. The cubic root of 61659564 is about 395.0634176871.

The spelling of 61659564 in words is "sixty-one million, six hundred fifty-nine thousand, five hundred sixty-four".