61555151601 has 24 divisors (see below), whose sum is σ = 91106302560. Its totient is φ = 40025016000.

The previous prime is 61555151587. The next prime is 61555151611. The reversal of 61555151601 is 10615155516.

It is a happy number.

It is not a de Polignac number, because 61555151601 - 2⁵ = 61555151569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61555151611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1474230 + ... + 1515408.

It is an arithmetic number, because the mean of its divisors is an integer number (3796095940).

Almost surely, 2^61555151601 is an apocalyptic number.

It is an amenable number.

61555151601 is a deficient number, since it is larger than the sum of its proper divisors (29551150959).

61555151601 is a wasteful number, since it uses less digits than its factorization.

61555151601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45277 (or 45274 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 61555151601 in words is "sixty-one billion, five hundred fifty-five million, one hundred fifty-one thousand, six hundred one".