166115636421243 has 64 divisors (see below), whose sum is σ = 257166212083200. Its totient is φ = 94702475427840.

The previous prime is 166115636421199. The next prime is 166115636421247. The reversal of 166115636421243 is 342124636511661.

It is not a de Polignac number, because 166115636421243 - 2⁹ = 166115636420731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (166115636421247) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33090046 + ... + 37778067.

It is an arithmetic number, because the mean of its divisors is an integer number (4018222063800).

Almost surely, 2^{166115636421243} is an apocalyptic number.

166115636421243 is a deficient number, since it is larger than the sum of its proper divisors (91050575661957).

166115636421243 is a wasteful number, since it uses less digits than its factorization.

166115636421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70868252.

The product of its digits is 3732480, while the sum is 51.

The spelling of 166115636421243 in words is "one hundred sixty-six trillion, one hundred fifteen billion, six hundred thirty-six million, four hundred twenty-one thousand, two hundred forty-three".