61663544 has 8 divisors (see below), whose sum is σ = 115619160. Its totient is φ = 30831768.

The previous prime is 61663543. The next prime is 61663583. The reversal of 61663544 is 44536616.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61663543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3853964 + ... + 3853979.

It is an arithmetic number, because the mean of its divisors is an integer number (14452395).

Almost surely, 2^61663544 is an apocalyptic number.

It is an amenable number.

61663544 is a deficient number, since it is larger than the sum of its proper divisors (53955616).

61663544 is a wasteful number, since it uses less digits than its factorization.

61663544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7707949 (or 7707945 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 61663544 is about 7852.6138323491. The cubic root of 61663544 is about 395.0719176855.

The spelling of 61663544 in words is "sixty-one million, six hundred sixty-three thousand, five hundred forty-four".