61057657578 has 8 divisors (see below), whose sum is σ = 122115315168. Its totient is φ = 20352552524.

The previous prime is 61057657571. The next prime is 61057657597. The reversal of 61057657578 is 87575675016.

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

61057657578 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (61057657571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5088138126 + ... + 5088138137.

It is an arithmetic number, because the mean of its divisors is an integer number (15264414396).

Almost surely, 2^61057657578 is an apocalyptic number.

61057657578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61057657578 is a wasteful number, since it uses less digits than its factorization.

61057657578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10176276268.

The product of its (nonzero) digits is 12348000, while the sum is 57.

The spelling of 61057657578 in words is "sixty-one billion, fifty-seven million, six hundred fifty-seven thousand, five hundred seventy-eight".