80661357 has 24 divisors (see below), whose sum is σ = 133760640. Its totient is φ = 45882720.

The previous prime is 80661341. The next prime is 80661359. The reversal of 80661357 is 75316608.

It is not a de Polignac number, because 80661357 - 2⁴ = 80661341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80661359) 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, 11632 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (5573360).

Almost surely, 2^80661357 is an apocalyptic number.

It is an amenable number.

80661357 is a deficient number, since it is larger than the sum of its proper divisors (53099283).

80661357 is a wasteful number, since it uses less digits than its factorization.

80661357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5833 (or 5830 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 80661357 is about 8981.1667950217. The cubic root of 80661357 is about 432.0710563417.

It can be divided in two parts, 80661 and 357, that added together give a palindrome (81018).

The spelling of 80661357 in words is "eighty million, six hundred sixty-one thousand, three hundred fifty-seven".