80978663 has 2 divisors, whose sum is σ = 80978664. Its totient is φ = 80978662.

The previous prime is 80978657. The next prime is 80978671. The reversal of 80978663 is 36687908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80978663 - 2¹² = 80974567 is a prime.

It is a super-2 number, since 2×80978663² = 13115087722535138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80978683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40489331 + 40489332.

It is an arithmetic number, because the mean of its divisors is an integer number (40489332).

Almost surely, 2^80978663 is an apocalyptic number.

80978663 is a deficient number, since it is larger than the sum of its proper divisors (1).

80978663 is an equidigital number, since it uses as much as digits as its factorization.

80978663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 80978663 is about 8998.8145330371. The cubic root of 80978663 is about 432.6368760532.

The spelling of 80978663 in words is "eighty million, nine hundred seventy-eight thousand, six hundred sixty-three".