61365557 has 8 divisors (see below), whose sum is σ = 67094400. Its totient is φ = 55661760.

The previous prime is 61365553. The next prime is 61365569. The reversal of 61365557 is 75556316.

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

It is not a de Polignac number, because 61365557 - 2² = 61365553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61365557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61365553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932 + ... + 11117.

It is an arithmetic number, because the mean of its divisors is an integer number (8386800).

Almost surely, 2^61365557 is an apocalyptic number.

It is an amenable number.

61365557 is a deficient number, since it is larger than the sum of its proper divisors (5728843).

61365557 is a wasteful number, since it uses less digits than its factorization.

61365557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12523.

The product of its digits is 94500, while the sum is 38.

The square root of 61365557 is about 7833.6171083351. The cubic root of 61365557 is about 394.4344992327.

The spelling of 61365557 in words is "sixty-one million, three hundred sixty-five thousand, five hundred fifty-seven".