61651556066 has 8 divisors (see below), whose sum is σ = 92884723920. Its totient is φ = 30689981428.

The previous prime is 61651556053. The next prime is 61651556081. The reversal of 61651556066 is 66065515616.

61651556066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61651556066.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67897736 + ... + 67898643.

It is an arithmetic number, because the mean of its divisors is an integer number (11610590490).

Almost surely, 2^61651556066 is an apocalyptic number.

61651556066 is a deficient number, since it is larger than the sum of its proper divisors (31233167854).

61651556066 is a wasteful number, since it uses less digits than its factorization.

61651556066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135796608.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 61651556066 in words is "sixty-one billion, six hundred fifty-one million, five hundred fifty-six thousand, sixty-six".