1661922698 has 4 divisors (see below), whose sum is σ = 2492884050. Its totient is φ = 830961348.

The previous prime is 1661922677. The next prime is 1661922701. The reversal of 1661922698 is 8962291661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1060348969 + 601573729 = 32563^2 + 24527^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415480673 + ... + 415480676.

Almost surely, 2^1661922698 is an apocalyptic number.

1661922698 is a deficient number, since it is larger than the sum of its proper divisors (830961352).

1661922698 is an equidigital number, since it uses as much as digits as its factorization.

1661922698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830961351.

The product of its digits is 559872, while the sum is 50.

The square root of 1661922698 is about 40766.6861297310. The cubic root of 1661922698 is about 1184.5051131301.

The spelling of 1661922698 in words is "one billion, six hundred sixty-one million, nine hundred twenty-two thousand, six hundred ninety-eight".