61077685338 has 80 divisors (see below), whose sum is σ = 137933262720. Its totient is φ = 20199901824.

The previous prime is 61077685297. The next prime is 61077685367. The reversal of 61077685338 is 83358677016.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18984306 + ... + 18987522.

It is an arithmetic number, because the mean of its divisors is an integer number (1724165784).

Almost surely, 2^61077685338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61077685338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68966631360).

61077685338 is an abundant number, since it is smaller than the sum of its proper divisors (76855577382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61077685338 is a wasteful number, since it uses less digits than its factorization.

61077685338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113 (or 4104 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 61077685338 in words is "sixty-one billion, seventy-seven million, six hundred eighty-five thousand, three hundred thirty-eight".