80661501 has 40 divisors (see below), whose sum is σ = 124407360. Its totient is φ = 52062912.

The previous prime is 80661461. The next prime is 80661521. The reversal of 80661501 is 10516608.

It is not a de Polignac number, because 80661501 - 2²¹ = 78564349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80661521) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 482920 + ... + 483086.

It is an arithmetic number, because the mean of its divisors is an integer number (3110184).

Almost surely, 2^80661501 is an apocalyptic number.

80661501 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

80661501 is a deficient number, since it is larger than the sum of its proper divisors (43745859).

80661501 is a wasteful number, since it uses less digits than its factorization.

80661501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 80661501 is about 8981.1748117938. The cubic root of 80661501 is about 432.0713134586.

The spelling of 80661501 in words is "eighty million, six hundred sixty-one thousand, five hundred one".