61605651 has 4 divisors (see below), whose sum is σ = 82140872. Its totient is φ = 41070432.

The previous prime is 61605647. The next prime is 61605653. The reversal of 61605651 is 15650616.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61605651 - 2² = 61605647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61605653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10267606 + ... + 10267611.

It is an arithmetic number, because the mean of its divisors is an integer number (20535218).

Almost surely, 2^61605651 is an apocalyptic number.

61605651 is a deficient number, since it is larger than the sum of its proper divisors (20535221).

61605651 is a wasteful number, since it uses less digits than its factorization.

61605651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20535220.

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

The square root of 61605651 is about 7848.9267419183. The cubic root of 61605651 is about 394.9482408279.

It can be divided in two parts, 6160 and 5651, that added together give a palindrome (11811).

The spelling of 61605651 in words is "sixty-one million, six hundred five thousand, six hundred fifty-one".