61819582388 has 48 divisors (see below), whose sum is σ = 114029731200. Its totient is φ = 29292969600.

The previous prime is 61819582343. The next prime is 61819582393. The reversal of 61819582388 is 88328591816.

It is a super-3 number, since 3×61819582388³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 919313 + ... + 984263.

It is an arithmetic number, because the mean of its divisors is an integer number (2375619400).

Almost surely, 2^61819582388 is an apocalyptic number.

It is an amenable number.

61819582388 is a deficient number, since it is larger than the sum of its proper divisors (52210148812).

61819582388 is a wasteful number, since it uses less digits than its factorization.

61819582388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65160 (or 65158 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 59.

The spelling of 61819582388 in words is "sixty-one billion, eight hundred nineteen million, five hundred eighty-two thousand, three hundred eighty-eight".