61656646 has 4 divisors (see below), whose sum is σ = 92484972. Its totient is φ = 30828322.

The previous prime is 61656643. The next prime is 61656659. The reversal of 61656646 is 64665616.

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

It is a junction number, because it is equal to n+sod(n) for n = 61656599 and 61656608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15414160 + ... + 15414163.

It is an arithmetic number, because the mean of its divisors is an integer number (23121243).

Almost surely, 2^61656646 is an apocalyptic number.

61656646 is a deficient number, since it is larger than the sum of its proper divisors (30828326).

61656646 is a wasteful number, since it uses less digits than its factorization.

61656646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30828325.

The product of its digits is 155520, while the sum is 40.

The square root of 61656646 is about 7852.1746032548. The cubic root of 61656646 is about 395.0571855464.

The spelling of 61656646 in words is "sixty-one million, six hundred fifty-six thousand, six hundred forty-six".