166420611453425 has 12 divisors (see below), whose sum is σ = 235841780802816. Its totient is φ = 114116990710800.

The previous prime is 166420611453409. The next prime is 166420611453451. The reversal of 166420611453425 is 524354116024661.

It is a happy number.

It is not a de Polignac number, because 166420611453425 - 2⁴ = 166420611453409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475487461121 + ... + 475487461470.

It is an arithmetic number, because the mean of its divisors is an integer number (19653481733568).

Almost surely, 2^{166420611453425} is an apocalyptic number.

It is an amenable number.

166420611453425 is a deficient number, since it is larger than the sum of its proper divisors (69421169349391).

166420611453425 is an equidigital number, since it uses as much as digits as its factorization.

166420611453425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950974922608 (or 950974922603 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 166420611453425 in words is "one hundred sixty-six trillion, four hundred twenty billion, six hundred eleven million, four hundred fifty-three thousand, four hundred twenty-five".