66407125015 has 48 divisors (see below), whose sum is σ = 104457153024. Its totient is φ = 39596736960.

The previous prime is 66407125009. The next prime is 66407125051. The reversal of 66407125015 is 51052170466.

It is a happy number.

66407125015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66407125015 - 2¹³ = 66407116823 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, 243477 + ... + 438286.

It is an arithmetic number, because the mean of its divisors is an integer number (2176190688).

Almost surely, 2^66407125015 is an apocalyptic number.

66407125015 is a deficient number, since it is larger than the sum of its proper divisors (38050028009).

66407125015 is a wasteful number, since it uses less digits than its factorization.

66407125015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681820 (or 681809 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 66407125015 in words is "sixty-six billion, four hundred seven million, one hundred twenty-five thousand, fifteen".