87666145834257 has 12 divisors (see below), whose sum is σ = 126629337918720. Its totient is φ = 58443884637048.

The previous prime is 87666145834219. The next prime is 87666145834259. The reversal of 87666145834257 is 75243854166678.

It is not a de Polignac number, because 87666145834257 - 2¹² = 87666145830161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87666145834259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15083157 + ... + 20070722.

It is an arithmetic number, because the mean of its divisors is an integer number (10552444826560).

Almost surely, 2^{87666145834257} is an apocalyptic number.

It is an amenable number.

87666145834257 is a deficient number, since it is larger than the sum of its proper divisors (38963192084463).

87666145834257 is a wasteful number, since it uses less digits than its factorization.

87666145834257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35430972 (or 35430969 counting only the distinct ones).

The product of its digits is 1625702400, while the sum is 72.

The spelling of 87666145834257 in words is "eighty-seven trillion, six hundred sixty-six billion, one hundred forty-five million, eight hundred thirty-four thousand, two hundred fifty-seven".