61551555606161 has 8 divisors (see below), whose sum is σ = 64793946002400. Its totient is φ = 58309448693760.

The previous prime is 61551555606139. The next prime is 61551555606217. The reversal of 61551555606161 is 16160655515516.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61551555606161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61551555606131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70425200 + ... + 71293841.

It is an arithmetic number, because the mean of its divisors is an integer number (8099243250300).

Almost surely, 2^{61551555606161} is an apocalyptic number.

It is an amenable number.

61551555606161 is a deficient number, since it is larger than the sum of its proper divisors (3242390396239).

61551555606161 is a wasteful number, since it uses less digits than its factorization.

61551555606161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141741919.

The product of its (nonzero) digits is 4050000, while the sum is 53.

The spelling of 61551555606161 in words is "sixty-one trillion, five hundred fifty-one billion, five hundred fifty-five million, six hundred six thousand, one hundred sixty-one".