61655661011 has 12 divisors (see below), whose sum is σ = 70547691696. Its totient is φ = 52784724720.

The previous prime is 61655660993. The next prime is 61655661037. The reversal of 61655661011 is 11016655616.

It is a de Polignac number, because none of the positive numbers 2^k-61655661011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61655661211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5804141 + ... + 5814753.

It is an arithmetic number, because the mean of its divisors is an integer number (5878974308).

Almost surely, 2^61655661011 is an apocalyptic number.

61655661011 is a deficient number, since it is larger than the sum of its proper divisors (8892030685).

61655661011 is an frugal number, since it uses more digits than its factorization.

61655661011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12442 (or 11531 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 61655661011 in words is "sixty-one billion, six hundred fifty-five million, six hundred sixty-one thousand, eleven".