61385186771 has 4 divisors (see below), whose sum is σ = 61485326352. Its totient is φ = 61285047192.

The previous prime is 61385186713. The next prime is 61385186789. The reversal of 61385186771 is 17768158316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61385186771 - 2³⁴ = 44205317587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61385186701) 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, 50068871 + ... + 50070096.

It is an arithmetic number, because the mean of its divisors is an integer number (15371331588).

Almost surely, 2^61385186771 is an apocalyptic number.

61385186771 is a deficient number, since it is larger than the sum of its proper divisors (100139581).

61385186771 is a wasteful number, since it uses less digits than its factorization.

61385186771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100139580.

The product of its digits is 1693440, while the sum is 53.

The spelling of 61385186771 in words is "sixty-one billion, three hundred eighty-five million, one hundred eighty-six thousand, seven hundred seventy-one".