61377789849 has 4 divisors (see below), whose sum is σ = 81837053136. Its totient is φ = 40918526564.

The previous prime is 61377789841. The next prime is 61377789883. The reversal of 61377789849 is 94898777316.

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 61377789849 - 2³ = 61377789841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61377789841) 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, 10229631639 + ... + 10229631644.

It is an arithmetic number, because the mean of its divisors is an integer number (20459263284).

Almost surely, 2^61377789849 is an apocalyptic number.

It is an amenable number.

61377789849 is a deficient number, since it is larger than the sum of its proper divisors (20459263287).

61377789849 is a wasteful number, since it uses less digits than its factorization.

61377789849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20459263286.

The product of its digits is 128024064, while the sum is 69.

The spelling of 61377789849 in words is "sixty-one billion, three hundred seventy-seven million, seven hundred eighty-nine thousand, eight hundred forty-nine".