61377565 has 16 divisors (see below), whose sum is σ = 78176448. Its totient is φ = 46100736.

The previous prime is 61377553. The next prime is 61377571. The reversal of 61377565 is 56577316.

It is a happy number.

It is not a de Polignac number, because 61377565 - 2⁹ = 61377053 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 15 ways as a sum of consecutive naturals, for example, 54094 + ... + 55216.

It is an arithmetic number, because the mean of its divisors is an integer number (4886028).

Almost surely, 2^61377565 is an apocalyptic number.

It is an amenable number.

61377565 is a deficient number, since it is larger than the sum of its proper divisors (16798883).

61377565 is a wasteful number, since it uses less digits than its factorization.

61377565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788.

The product of its digits is 132300, while the sum is 40.

The square root of 61377565 is about 7834.3835111641. The cubic root of 61377565 is about 394.4602251763.

The spelling of 61377565 in words is "sixty-one million, three hundred seventy-seven thousand, five hundred sixty-five".