61555516 has 48 divisors (see below), whose sum is σ = 128016000. Its totient is φ = 25583040.

The previous prime is 61555499. The next prime is 61555523.

61555516 is nontrivially palindromic in base 10.

It is a congruent number.

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, 22975 + ... + 25513.

It is an arithmetic number, because the mean of its divisors is an integer number (2667000).

Almost surely, 2^61555516 is an apocalyptic number.

It is an amenable number.

61555516 is an abundant number, since it is smaller than the sum of its proper divisors (66460484).

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

61555516 is a wasteful number, since it uses less digits than its factorization.

61555516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602 (or 2600 counting only the distinct ones).

The product of its digits is 22500, while the sum is 34.

The square root of 61555516 is about 7845.7323431277. The cubic root of 61555516 is about 394.8410747726.

The spelling of 61555516 in words is "sixty-one million, five hundred fifty-five thousand, five hundred sixteen".