166153621450 has 12 divisors (see below), whose sum is σ = 309045735990. Its totient is φ = 66461448560.

The previous prime is 166153621427. The next prime is 166153621457. The reversal of 166153621450 is 54126351661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 70798034241 + 95355587209 = 266079^2 + 308797^2 .

It is not an unprimeable number, because it can be changed into a prime (166153621457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1661536165 + ... + 1661536264.

Almost surely, 2^166153621450 is an apocalyptic number.

166153621450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166153621450 is a deficient number, since it is larger than the sum of its proper divisors (142892114540).

166153621450 is a wasteful number, since it uses less digits than its factorization.

166153621450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323072441 (or 3323072436 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 166153621450 in words is "one hundred sixty-six billion, one hundred fifty-three million, six hundred twenty-one thousand, four hundred fifty".