61161565 has 8 divisors (see below), whose sum is σ = 73489248. Its totient is φ = 48865680.

The previous prime is 61161559. The next prime is 61161587. The reversal of 61161565 is 56516116.

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

It is a de Polignac number, because none of the positive numbers 2^k-61161565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3487 + ... + 11596.

It is an arithmetic number, because the mean of its divisors is an integer number (9186156).

Almost surely, 2^61161565 is an apocalyptic number.

It is an amenable number.

61161565 is a deficient number, since it is larger than the sum of its proper divisors (12327683).

61161565 is a wasteful number, since it uses less digits than its factorization.

61161565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15899.

The product of its digits is 5400, while the sum is 31.

The square root of 61161565 is about 7820.5859754880. The cubic root of 61161565 is about 393.9969530028.

The spelling of 61161565 in words is "sixty-one million, one hundred sixty-one thousand, five hundred sixty-five".