61777217125 has 32 divisors (see below), whose sum is σ = 84795250176. Its totient is φ = 44649403200.

The previous prime is 61777217069. The next prime is 61777217141. The reversal of 61777217125 is 52171277716.

It is not a de Polignac number, because 61777217125 - 2¹¹ = 61777215077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328059 + ... + 480808.

It is an arithmetic number, because the mean of its divisors is an integer number (2649851568).

Almost surely, 2^61777217125 is an apocalyptic number.

61777217125 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61777217125 is a deficient number, since it is larger than the sum of its proper divisors (23018033051).

61777217125 is a wasteful number, since it uses less digits than its factorization.

61777217125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808942 (or 808932 counting only the distinct ones).

The product of its digits is 288120, while the sum is 46.

The spelling of 61777217125 in words is "sixty-one billion, seven hundred seventy-seven million, two hundred seventeen thousand, one hundred twenty-five".