61254978165 has 48 divisors (see below), whose sum is σ = 110991867840. Its totient is φ = 32052720960.

The previous prime is 61254978163. The next prime is 61254978217. The reversal of 61254978165 is 56187945216.

It is a happy number.

61254978165 is a `hidden beast` number, since 6 + 12 + 5 + 497 + 81 + 65 = 666.

It is not a de Polignac number, because 61254978165 - 2¹ = 61254978163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61254978163) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 298450 + ... + 459980.

It is an arithmetic number, because the mean of its divisors is an integer number (2312330580).

Almost surely, 2^61254978165 is an apocalyptic number.

It is an amenable number.

61254978165 is a deficient number, since it is larger than the sum of its proper divisors (49736889675).

61254978165 is a wasteful number, since it uses less digits than its factorization.

61254978165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161651 (or 161592 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 61254978165 in words is "sixty-one billion, two hundred fifty-four million, nine hundred seventy-eight thousand, one hundred sixty-five".