61665544 has 8 divisors (see below), whose sum is σ = 115622910. Its totient is φ = 30832768.

The previous prime is 61665533. The next prime is 61665557. The reversal of 61665544 is 44556616.

It can be written as a sum of positive squares in only one way, i.e., 38912644 + 22752900 = 6238^2 + 4770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) 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 as a sum of consecutive naturals, namely, 3854089 + ... + 3854104.

Almost surely, 2^61665544 is an apocalyptic number.

It is an amenable number.

61665544 is a deficient number, since it is larger than the sum of its proper divisors (53957366).

61665544 is a wasteful number, since it uses less digits than its factorization.

61665544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7708199 (or 7708195 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 61665544 is about 7852.7411774488. The cubic root of 61665544 is about 395.0761889033.

The spelling of 61665544 in words is "sixty-one million, six hundred sixty-five thousand, five hundred forty-four".