61519974420 has 24 divisors (see below), whose sum is σ = 172255928544. Its totient is φ = 16405326496.

The previous prime is 61519974403. The next prime is 61519974443. The reversal of 61519974420 is 2447991516.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61519974420.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512666394 + ... + 512666513.

It is an arithmetic number, because the mean of its divisors is an integer number (7177330356).

Almost surely, 2^61519974420 is an apocalyptic number.

61519974420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61519974420 is an abundant number, since it is smaller than the sum of its proper divisors (110735954124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61519974420 is a wasteful number, since it uses less digits than its factorization.

61519974420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025332919 (or 1025332917 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 61519974420 in words is "sixty-one billion, five hundred nineteen million, nine hundred seventy-four thousand, four hundred twenty".