61342598781 has 16 divisors (see below), whose sum is σ = 90882025920. Its totient is φ = 40893220080.

The previous prime is 61342598777. The next prime is 61342598791. The reversal of 61342598781 is 18789524316.

61342598781 is a `hidden beast` number, since 6 + 1 + 3 + 42 + 598 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 61342598781 - 2² = 61342598777 is a prime.

It is a super-2 number, since 2×61342598781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61342598711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 839206 + ... + 909368.

It is an arithmetic number, because the mean of its divisors is an integer number (5680126620).

Almost surely, 2^61342598781 is an apocalyptic number.

It is an amenable number.

61342598781 is a deficient number, since it is larger than the sum of its proper divisors (29539427139).

61342598781 is a wasteful number, since it uses less digits than its factorization.

61342598781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102553 (or 102547 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 61342598781 in words is "sixty-one billion, three hundred forty-two million, five hundred ninety-eight thousand, seven hundred eighty-one".