1661682398 has 24 divisors (see below), whose sum is σ = 2591120064. Its totient is φ = 799225260.

The previous prime is 1661682389. The next prime is 1661682409. The reversal of 1661682398 is 8932861661.

It is a super-2 number, since 2×1661682398² = 5522376783646060808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9950111 + ... + 9950277.

It is an arithmetic number, because the mean of its divisors is an integer number (107963336).

Almost surely, 2^1661682398 is an apocalyptic number.

1661682398 is a deficient number, since it is larger than the sum of its proper divisors (929437666).

1661682398 is an frugal number, since it uses more digits than its factorization.

1661682398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 200 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 1661682398 is about 40763.7387637591. The cubic root of 1661682398 is about 1184.4480205632.

The spelling of 1661682398 in words is "one billion, six hundred sixty-one million, six hundred eighty-two thousand, three hundred ninety-eight".