166001043720 has 32 divisors (see below), whose sum is σ = 498003131520. Its totient is φ = 44266944960.

The previous prime is 166001043697. The next prime is 166001043731. The reversal of 166001043720 is 27340100661.

166001043720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166001043720² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 691670896 + ... + 691671135.

It is an arithmetic number, because the mean of its divisors is an integer number (15562597860).

Almost surely, 2^166001043720 is an apocalyptic number.

166001043720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166001043720 is an abundant number, since it is smaller than the sum of its proper divisors (332002087800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166001043720 is a wasteful number, since it uses less digits than its factorization.

166001043720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383342045 (or 1383342041 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The spelling of 166001043720 in words is "one hundred sixty-six billion, one million, forty-three thousand, seven hundred twenty".