61978147047 has 6 divisors (see below), whose sum is σ = 89523990192. Its totient is φ = 41318764692.

The previous prime is 61978147039. The next prime is 61978147067. The reversal of 61978147047 is 74074187916.

It is a happy number.

61978147047 is a `hidden beast` number, since 6 + 1 + 97 + 81 + 470 + 4 + 7 = 666.

It is not a de Polignac number, because 61978147047 - 2³ = 61978147039 is a prime.

It is a super-2 number, since 2×61978147047² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61978146984 and 61978147002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61978147067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3443230383 + ... + 3443230400.

It is an arithmetic number, because the mean of its divisors is an integer number (14920665032).

Almost surely, 2^61978147047 is an apocalyptic number.

61978147047 is a deficient number, since it is larger than the sum of its proper divisors (27545843145).

61978147047 is a wasteful number, since it uses less digits than its factorization.

61978147047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6886460789 (or 6886460786 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 61978147047 in words is "sixty-one billion, nine hundred seventy-eight million, one hundred forty-seven thousand, forty-seven".