61947153478 has 16 divisors (see below), whose sum is σ = 108362368800. Its totient is φ = 26548779768.

The previous prime is 61947153461. The next prime is 61947153509. The reversal of 61947153478 is 87435174916.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 45150301 + ... + 45151672.

It is an arithmetic number, because the mean of its divisors is an integer number (6772648050).

Almost surely, 2^61947153478 is an apocalyptic number.

61947153478 is a deficient number, since it is larger than the sum of its proper divisors (46415215322).

61947153478 is an equidigital number, since it uses as much as digits as its factorization.

61947153478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90301996 (or 90301982 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 55.

The spelling of 61947153478 in words is "sixty-one billion, nine hundred forty-seven million, one hundred fifty-three thousand, four hundred seventy-eight".