61557117 has 8 divisors (see below), whose sum is σ = 82998720. Its totient is φ = 40576800.

The previous prime is 61557101. The next prime is 61557127. The reversal of 61557117 is 71175516.

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

It is not a de Polignac number, because 61557117 - 2⁴ = 61557101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61557127) 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, 115009 + ... + 115542.

It is an arithmetic number, because the mean of its divisors is an integer number (10374840).

Almost surely, 2^61557117 is an apocalyptic number.

It is an amenable number.

61557117 is a deficient number, since it is larger than the sum of its proper divisors (21441603).

61557117 is a wasteful number, since it uses less digits than its factorization.

61557117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230643.

The product of its digits is 7350, while the sum is 33.

The square root of 61557117 is about 7845.8343724552. The cubic root of 61557117 is about 394.8444978890.

The spelling of 61557117 in words is "sixty-one million, five hundred fifty-seven thousand, one hundred seventeen".