61216903820 has 48 divisors (see below), whose sum is σ = 130935722400. Its totient is φ = 24037347840.

The previous prime is 61216903789. The next prime is 61216903837. The reversal of 61216903820 is 2830961216.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 123710 + ... + 371130.

It is an arithmetic number, because the mean of its divisors is an integer number (2727827550).

Almost surely, 2^61216903820 is an apocalyptic number.

It is a pronic number, being equal to 247420×247421.

It is an amenable number.

61216903820 is an abundant number, since it is smaller than the sum of its proper divisors (69718818580).

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

61216903820 is a wasteful number, since it uses less digits than its factorization.

61216903820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247658 (or 247656 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 61216903820 in words is "sixty-one billion, two hundred sixteen million, nine hundred three thousand, eight hundred twenty".