166213457554 has 16 divisors (see below), whose sum is σ = 251682888600. Its totient is φ = 82319618304.

The previous prime is 166213457537. The next prime is 166213457561. The reversal of 166213457554 is 455754312661.

It can be written as a sum of positive squares in 4 ways, for example, as 152658211225 + 13555246329 = 390715^2 + 116427^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166213457498 and 166213457507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626314 + ... + 851290.

Almost surely, 2^166213457554 is an apocalyptic number.

166213457554 is a deficient number, since it is larger than the sum of its proper divisors (85469431046).

166213457554 is a wasteful number, since it uses less digits than its factorization.

166213457554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228477.

The product of its digits is 3024000, while the sum is 49.

The spelling of 166213457554 in words is "one hundred sixty-six billion, two hundred thirteen million, four hundred fifty-seven thousand, five hundred fifty-four".