61517554791 has 24 divisors (see below), whose sum is σ = 102269215104. Its totient is φ = 31955213040.

The previous prime is 61517554789. The next prime is 61517554823. The reversal of 61517554791 is 19745571516.

It is not a de Polignac number, because 61517554791 - 2¹ = 61517554789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61517554711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3761530 + ... + 3777848.

It is an arithmetic number, because the mean of its divisors is an integer number (4261217296).

Almost surely, 2^61517554791 is an apocalyptic number.

61517554791 is a deficient number, since it is larger than the sum of its proper divisors (40751660313).

61517554791 is an frugal number, since it uses more digits than its factorization.

61517554791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32659 (or 16340 counting only the distinct ones).

The product of its digits is 1323000, while the sum is 51.

It can be divided in two parts, 615175 and 54791, that added together give a palindrome (669966).

The spelling of 61517554791 in words is "sixty-one billion, five hundred seventeen million, five hundred fifty-four thousand, seven hundred ninety-one".