61546493977 has 4 divisors (see below), whose sum is σ = 61547201296. Its totient is φ = 61545786660.

The previous prime is 61546493941. The next prime is 61546494011. The reversal of 61546493977 is 77939464516.

61546493977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61546493977 - 2¹⁵ = 61546461209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61546490977) 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, 201243 + ... + 404464.

It is an arithmetic number, because the mean of its divisors is an integer number (15386800324).

Almost surely, 2^61546493977 is an apocalyptic number.

It is an amenable number.

61546493977 is a deficient number, since it is larger than the sum of its proper divisors (707319).

61546493977 is a wasteful number, since it uses less digits than its factorization.

61546493977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707318.

The product of its digits is 34292160, while the sum is 61.

The spelling of 61546493977 in words is "sixty-one billion, five hundred forty-six million, four hundred ninety-three thousand, nine hundred seventy-seven".