61253685581 has 8 divisors (see below), whose sum is σ = 66824306400. Its totient is φ = 55683415440.

The previous prime is 61253685569. The next prime is 61253685607. The reversal of 61253685581 is 18558635216.

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-61253685581 is a prime.

It is a super-2 number, since 2×61253685581² (a number of 22 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 (61253655581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391415 + ... + 525083.

It is an arithmetic number, because the mean of its divisors is an integer number (8353038300).

Almost surely, 2^61253685581 is an apocalyptic number.

It is an amenable number.

61253685581 is a deficient number, since it is larger than the sum of its proper divisors (5570620819).

61253685581 is a wasteful number, since it uses less digits than its factorization.

61253685581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175339.

The product of its digits is 1728000, while the sum is 50.

The spelling of 61253685581 in words is "sixty-one billion, two hundred fifty-three million, six hundred eighty-five thousand, five hundred eighty-one".