61761788889 has 4 divisors (see below), whose sum is σ = 82349051856. Its totient is φ = 41174525924.

The previous prime is 61761788861. The next prime is 61761788897. The reversal of 61761788889 is 98888716716.

61761788889 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 61761788889 - 2¹⁹ = 61761264601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61761788789) 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, 10293631479 + ... + 10293631484.

It is an arithmetic number, because the mean of its divisors is an integer number (20587262964).

Almost surely, 2^61761788889 is an apocalyptic number.

It is an amenable number.

61761788889 is a deficient number, since it is larger than the sum of its proper divisors (20587262967).

61761788889 is a wasteful number, since it uses less digits than its factorization.

61761788889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20587262966.

The product of its digits is 65028096, while the sum is 69.

The spelling of 61761788889 in words is "sixty-one billion, seven hundred sixty-one million, seven hundred eighty-eight thousand, eight hundred eighty-nine".