66798015 has 48 divisors (see below), whose sum is σ = 119656320. Its totient is φ = 31726080.

The previous prime is 66798001. The next prime is 66798023. The reversal of 66798015 is 51089766.

It is not a de Polignac number, because 66798015 - 2⁹ = 66797503 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81960 + ... + 82770.

It is an arithmetic number, because the mean of its divisors is an integer number (2492840).

Almost surely, 2^66798015 is an apocalyptic number.

66798015 is a deficient number, since it is larger than the sum of its proper divisors (52858305).

66798015 is a wasteful number, since it uses less digits than its factorization.

66798015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 66798015 is about 8173.0052612243. The cubic root of 66798015 is about 405.7462540403.

The spelling of 66798015 in words is "sixty-six million, seven hundred ninety-eight thousand, fifteen".