61478918464 has 14 divisors (see below), whose sum is σ = 121997228954. Its totient is φ = 30739459200.

The previous prime is 61478918443. The next prime is 61478918509. The reversal of 61478918464 is 46481987416.

It can be written as a sum of positive squares in only one way, i.e., 53357304064 + 8121614400 = 230992^2 + 90120^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61478918399 and 61478918408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480303987 + ... + 480304114.

Almost surely, 2^61478918464 is an apocalyptic number.

61478918464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61478918464 is a deficient number, since it is larger than the sum of its proper divisors (60518310490).

61478918464 is an equidigital number, since it uses as much as digits as its factorization.

61478918464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960608113 (or 960608103 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 58.

The spelling of 61478918464 in words is "sixty-one billion, four hundred seventy-eight million, nine hundred eighteen thousand, four hundred sixty-four".