61066537577 has 4 divisors (see below), whose sum is σ = 61373404800. Its totient is φ = 60759670356.

The previous prime is 61066537561. The next prime is 61066537601. The reversal of 61066537577 is 77573566016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61066537577 - 2⁴ = 61066537561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61066537277) 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, 153433313 + ... + 153433710.

It is an arithmetic number, because the mean of its divisors is an integer number (15343351200).

Almost surely, 2^61066537577 is an apocalyptic number.

It is an amenable number.

61066537577 is a deficient number, since it is larger than the sum of its proper divisors (306867223).

61066537577 is a wasteful number, since it uses less digits than its factorization.

61066537577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306867222.

The product of its (nonzero) digits is 5556600, while the sum is 53.

The spelling of 61066537577 in words is "sixty-one billion, sixty-six million, five hundred thirty-seven thousand, five hundred seventy-seven".