61217011251 has 24 divisors (see below), whose sum is σ = 100035883584. Its totient is φ = 37101217320.

The previous prime is 61217011249. The next prime is 61217011279. The reversal of 61217011251 is 15211071216.

61217011251 is a `hidden beast` number, since 612 + 17 + 0 + 11 + 25 + 1 = 666.

It is not a de Polignac number, because 61217011251 - 2¹ = 61217011249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61217011201) 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 23 ways as a sum of consecutive naturals, for example, 11448321 + ... + 11453666.

It is an arithmetic number, because the mean of its divisors is an integer number (4168161816).

Almost surely, 2^61217011251 is an apocalyptic number.

61217011251 is a deficient number, since it is larger than the sum of its proper divisors (38818872333).

61217011251 is a wasteful number, since it uses less digits than its factorization.

61217011251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22902013 (or 22902001 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 27.

Adding to 61217011251 its reverse (15211071216), we get a palindrome (76428082467).

The spelling of 61217011251 in words is "sixty-one billion, two hundred seventeen million, eleven thousand, two hundred fifty-one".