61999008016 has 45 divisors (see below), whose sum is σ = 132059446743. Its totient is φ = 28176387360.

The previous prime is 61999008011. The next prime is 61999008017. The reversal of 61999008016 is 61080099916.

The square root of 61999008016 is 248996.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61999008011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10952995 + ... + 10958653.

Almost surely, 2^61999008016 is an apocalyptic number.

61999008016 is the 248996-th square number.

It is an amenable number.

61999008016 is an abundant number, since it is smaller than the sum of its proper divisors (70060438727).

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

61999008016 is an frugal number, since it uses more digits than its factorization.

61999008016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11348 (or 5672 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

Multiplying 61999008016 by its sum of digits (49), we get a square (3037951392784 = 1742972²).

The spelling of 61999008016 in words is "sixty-one billion, nine hundred ninety-nine million, eight thousand, sixteen".