80015720401 has 16 divisors (see below), whose sum is σ = 84731181568. Its totient is φ = 75442752000.

The previous prime is 80015720399. The next prime is 80015720419. The reversal of 80015720401 is 10402751008.

It is a 3-Lehmer number, since φ(80015720401) divides (80015720401-1)³.

It is a cyclic number.

It is not a de Polignac number, because 80015720401 - 2¹ = 80015720399 is a prime.

It is a super-2 number, since 2×80015720401² (a number of 23 digits) contains 22 as substring.

It is a deceptive number, since it divides R_80015720400.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80015720401.

It is not an unprimeable number, because it can be changed into a prime (80015720201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453601 + ... + 604801.

It is an arithmetic number, because the mean of its divisors is an integer number (5295698848).

It is a Poulet number, since it divides 2^80015720400-1.

Almost surely, 2^80015720401 is an apocalyptic number.

80015720401 is the 151201-st nonagonal number.

It is an amenable number.

80015720401 is a deficient number, since it is larger than the sum of its proper divisors (4715461167).

80015720401 is a wasteful number, since it uses less digits than its factorization.

80015720401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151672.

The product of its (nonzero) digits is 2240, while the sum is 28.

The spelling of 80015720401 in words is "eighty billion, fifteen million, seven hundred twenty thousand, four hundred one".