61605061610581 has 8 divisors (see below), whose sum is σ = 61853328250560. Its totient is φ = 61356901235232.

The previous prime is 61605061610569. The next prime is 61605061610591. The reversal of 61605061610581 is 18501616050616.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61605061610581 - 2¹⁷ = 61605061479509 is a prime.

It is a super-2 number, since 2×61605061610581² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605061610591) 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, 25404255 + ... + 27723388.

It is an arithmetic number, because the mean of its divisors is an integer number (7731666031320).

Almost surely, 2^{61605061610581} is an apocalyptic number.

It is an amenable number.

61605061610581 is a deficient number, since it is larger than the sum of its proper divisors (248266639979).

61605061610581 is a wasteful number, since it uses less digits than its factorization.

61605061610581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53132315.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 61605061610581 in words is "sixty-one trillion, six hundred five billion, sixty-one million, six hundred ten thousand, five hundred eighty-one".