166235700557 has 8 divisors (see below), whose sum is σ = 176018556600. Its totient is φ = 156453320704.

The previous prime is 166235700497. The next prime is 166235700571. The reversal of 166235700557 is 755007532661.

It can be written as a sum of positive squares in 4 ways, for example, as 54987436036 + 111248264521 = 234494^2 + 333539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166235700557 - 2³⁰ = 165161958733 is a prime.

It is a super-2 number, since 2×166235700557² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166235709557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804419 + ... + 989727.

It is an arithmetic number, because the mean of its divisors is an integer number (22002319575).

Almost surely, 2^166235700557 is an apocalyptic number.

166235700557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

166235700557 is a deficient number, since it is larger than the sum of its proper divisors (9782856043).

166235700557 is a wasteful number, since it uses less digits than its factorization.

166235700557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238095.

The product of its (nonzero) digits is 1323000, while the sum is 47.

The spelling of 166235700557 in words is "one hundred sixty-six billion, two hundred thirty-five million, seven hundred thousand, five hundred fifty-seven".