61999916 has 18 divisors (see below), whose sum is σ = 119261100. Its totient is φ = 28181560.

The previous prime is 61999897. The next prime is 61999967.

61999916 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63566 + ... + 64533.

Almost surely, 2^61999916 is an apocalyptic number.

It is an amenable number.

61999916 is a deficient number, since it is larger than the sum of its proper divisors (57261184).

61999916 is a wasteful number, since it uses less digits than its factorization.

61999916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128125 (or 128112 counting only the distinct ones).

The product of its digits is 236196, while the sum is 50.

The square root of 61999916 is about 7874.0025400047. The cubic root of 61999916 is about 395.7889822245.

The spelling of 61999916 in words is "sixty-one million, nine hundred ninety-nine thousand, nine hundred sixteen".