1661996502 has 32 divisors (see below), whose sum is σ = 3734834400. Its totient is φ = 547772544.

The previous prime is 1661996461. The next prime is 1661996503. The reversal of 1661996502 is 2056991661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661996503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168103 + ... + 177714.

It is an arithmetic number, because the mean of its divisors is an integer number (116713575).

Almost surely, 2^1661996502 is an apocalyptic number.

1661996502 is an abundant number, since it is smaller than the sum of its proper divisors (2072837898).

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

1661996502 is a wasteful number, since it uses less digits than its factorization.

1661996502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345917 (or 345911 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 1661996502 is about 40767.5913195764. The cubic root of 1661996502 is about 1184.5226470225.

The spelling of 1661996502 in words is "one billion, six hundred sixty-one million, nine hundred ninety-six thousand, five hundred two".