61577447577 has 8 divisors (see below), whose sum is σ = 82594900416. Its totient is φ = 40805813232.

The previous prime is 61577447551. The next prime is 61577447623. The reversal of 61577447577 is 77574477516.

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

It is not a de Polignac number, because 61577447577 - 2⁶ = 61577447513 is a prime.

It is a super-4 number, since 4×61577447577⁴ (a number of 44 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61577447577.

It is not an unprimeable number, because it can be changed into a prime (61577447507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61454038 + ... + 61455039.

It is an arithmetic number, because the mean of its divisors is an integer number (10324362552).

Almost surely, 2^61577447577 is an apocalyptic number.

It is an amenable number.

61577447577 is a deficient number, since it is larger than the sum of its proper divisors (21017452839).

61577447577 is a wasteful number, since it uses less digits than its factorization.

61577447577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122909247.

The product of its digits is 40336800, while the sum is 60.

The spelling of 61577447577 in words is "sixty-one billion, five hundred seventy-seven million, four hundred forty-seven thousand, five hundred seventy-seven".