61897527077 has 4 divisors (see below), whose sum is σ = 65155291680. Its totient is φ = 58639762476.

The previous prime is 61897527071. The next prime is 61897527101. The reversal of 61897527077 is 77072579816.

61897527077 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.

It is a cyclic number.

It is not a de Polignac number, because 61897527077 - 2⁴ = 61897527061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61897527071) 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, 1628882273 + ... + 1628882310.

It is an arithmetic number, because the mean of its divisors is an integer number (16288822920).

Almost surely, 2^61897527077 is an apocalyptic number.

It is an amenable number.

61897527077 is a deficient number, since it is larger than the sum of its proper divisors (3257764603).

61897527077 is a wasteful number, since it uses less digits than its factorization.

61897527077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257764602.

The product of its (nonzero) digits is 10372320, while the sum is 59.

The spelling of 61897527077 in words is "sixty-one billion, eight hundred ninety-seven million, five hundred twenty-seven thousand, seventy-seven".