1661984264 has 32 divisors (see below), whose sum is σ = 3304216800. Its totient is φ = 781499520.

The previous prime is 1661984257. The next prime is 1661984273. The reversal of 1661984264 is 4624891661.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19082 + ... + 60729.

It is an arithmetic number, because the mean of its divisors is an integer number (103256775).

Almost surely, 2^1661984264 is an apocalyptic number.

It is an amenable number.

1661984264 is a deficient number, since it is larger than the sum of its proper divisors (1642232536).

1661984264 is a wasteful number, since it uses less digits than its factorization.

1661984264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79973 (or 79969 counting only the distinct ones).

The product of its digits is 497664, while the sum is 47.

The square root of 1661984264 is about 40767.4412245851. The cubic root of 1661984264 is about 1184.5197396310.

The spelling of 1661984264 in words is "one billion, six hundred sixty-one million, nine hundred eighty-four thousand, two hundred sixty-four".