616001221890 has 32 divisors (see below), whose sum is σ = 1642669925760. Its totient is φ = 164266992432.

The previous prime is 616001221831. The next prime is 616001221909. The reversal of 616001221890 is 98122100616.

616001221890 is a `hidden beast` number, since 616 + 0 + 0 + 1 + 22 + 18 + 9 + 0 = 666.

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, 1140742734 + ... + 1140743273.

It is an arithmetic number, because the mean of its divisors is an integer number (51333435180).

Almost surely, 2^616001221890 is an apocalyptic number.

616001221890 is an abundant number, since it is smaller than the sum of its proper divisors (1026668703870).

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

616001221890 is a wasteful number, since it uses less digits than its factorization.

616001221890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281486023 (or 2281486017 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 616001221890 in words is "six hundred sixteen billion, one million, two hundred twenty-one thousand, eight hundred ninety".