61138247227 has 4 divisors (see below), whose sum is σ = 61445474800. Its totient is φ = 60831019656.

The previous prime is 61138247171. The next prime is 61138247293. The reversal of 61138247227 is 72274283116.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61138247227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61138247827) 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, 153613488 + ... + 153613885.

It is an arithmetic number, because the mean of its divisors is an integer number (15361368700).

Almost surely, 2^61138247227 is an apocalyptic number.

61138247227 is a deficient number, since it is larger than the sum of its proper divisors (307227573).

61138247227 is a wasteful number, since it uses less digits than its factorization.

61138247227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307227572.

The product of its digits is 225792, while the sum is 43.

The spelling of 61138247227 in words is "sixty-one billion, one hundred thirty-eight million, two hundred forty-seven thousand, two hundred twenty-seven".