61651617606 has 24 divisors (see below), whose sum is σ = 133833933480. Its totient is φ = 20511242496.

The previous prime is 61651617593. The next prime is 61651617647. The reversal of 61651617606 is 60671615616.

61651617606 is a `hidden beast` number, since 6 + 16 + 5 + 16 + 17 + 606 = 666.

61651617606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3265051 + ... + 3283878.

It is an arithmetic number, because the mean of its divisors is an integer number (5576413895).

Almost surely, 2^61651617606 is an apocalyptic number.

61651617606 is an abundant number, since it is smaller than the sum of its proper divisors (72182315874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61651617606 is a wasteful number, since it uses less digits than its factorization.

61651617606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6549460 (or 6549457 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 61651617606 in words is "sixty-one billion, six hundred fifty-one million, six hundred seventeen thousand, six hundred six".