80661898 has 4 divisors (see below), whose sum is σ = 120992850. Its totient is φ = 40330948.

The previous prime is 80661881. The next prime is 80661899. The reversal of 80661898 is 89816608.

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., 80048809 + 613089 = 8947^2 + 783^2 .

It is not an unprimeable number, because it can be changed into a prime (80661899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20165473 + ... + 20165476.

Almost surely, 2^80661898 is an apocalyptic number.

80661898 is a deficient number, since it is larger than the sum of its proper divisors (40330952).

80661898 is a wasteful number, since it uses less digits than its factorization.

80661898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40330951.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 80661898 is about 8981.1969135522. The cubic root of 80661898 is about 432.0720223140.

The spelling of 80661898 in words is "eighty million, six hundred sixty-one thousand, eight hundred ninety-eight".