61051665 has 32 divisors (see below), whose sum is σ = 102807936. Its totient is φ = 30896640.

The previous prime is 61051657. The next prime is 61051681. The reversal of 61051665 is 56615016.

It is not a de Polignac number, because 61051665 - 2³ = 61051657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21414 + ... + 24096.

It is an arithmetic number, because the mean of its divisors is an integer number (3212748).

Almost surely, 2^61051665 is an apocalyptic number.

It is an amenable number.

61051665 is a deficient number, since it is larger than the sum of its proper divisors (41756271).

61051665 is a wasteful number, since it uses less digits than its factorization.

61051665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 61051665 is about 7813.5564885652. The cubic root of 61051665 is about 393.7608230837.

It can be divided in two parts, 61051 and 665, that added together give a palindrome (61716).

The spelling of 61051665 in words is "sixty-one million, fifty-one thousand, six hundred sixty-five".