1681969698 has 48 divisors (see below), whose sum is σ = 4001568480. Its totient is φ = 527674176.

The previous prime is 1681969693. The next prime is 1681969711. The reversal of 1681969698 is 8969691861.

It is a super-2 number, since 2×1681969698² = 5658044129980422408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681969693) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93528 + ... + 110051.

It is an arithmetic number, because the mean of its divisors is an integer number (83366010).

Almost surely, 2^1681969698 is an apocalyptic number.

1681969698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1681969698 is an abundant number, since it is smaller than the sum of its proper divisors (2319598782).

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

1681969698 is a wasteful number, since it uses less digits than its factorization.

1681969698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203613 (or 203601 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 63.

The square root of 1681969698 is about 41011.8238804372. The cubic root of 1681969698 is about 1189.2488016092.

The spelling of 1681969698 in words is "one billion, six hundred eighty-one million, nine hundred sixty-nine thousand, six hundred ninety-eight".