61617517551 has 6 divisors (see below), whose sum is σ = 89003080920. Its totient is φ = 41078345028.

The previous prime is 61617517537. The next prime is 61617517561. The reversal of 61617517551 is 15571571616.

61617517551 is a `hidden beast` number, since 6 + 16 + 1 + 75 + 17 + 551 = 666.

It is not a de Polignac number, because 61617517551 - 2⁶ = 61617517487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61617517497 and 61617517506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61617517561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3423195411 + ... + 3423195428.

It is an arithmetic number, because the mean of its divisors is an integer number (14833846820).

Almost surely, 2^61617517551 is an apocalyptic number.

61617517551 is a deficient number, since it is larger than the sum of its proper divisors (27385563369).

61617517551 is a wasteful number, since it uses less digits than its factorization.

61617517551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6846390845 (or 6846390842 counting only the distinct ones).

The product of its digits is 220500, while the sum is 45.

The spelling of 61617517551 in words is "sixty-one billion, six hundred seventeen million, five hundred seventeen thousand, five hundred fifty-one".