646161401 has 8 divisors (see below), whose sum is σ = 651305664. Its totient is φ = 641033680.

The previous prime is 646161389. The next prime is 646161409. The reversal of 646161401 is 104161646.

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

It is a cyclic number.

It is not a de Polignac number, because 646161401 - 2¹⁰ = 646160377 is a prime.

It is a super-2 number, since 2×646161401² = 835049112284565602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646161409) 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, 81140 + ... + 88746.

It is an arithmetic number, because the mean of its divisors is an integer number (81413208).

Almost surely, 2^646161401 is an apocalyptic number.

It is an amenable number.

646161401 is a deficient number, since it is larger than the sum of its proper divisors (5144263).

646161401 is a wasteful number, since it uses less digits than its factorization.

646161401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 646161401 is about 25419.7049746845. The cubic root of 646161401 is about 864.5305352324.

The spelling of 646161401 in words is "six hundred forty-six million, one hundred sixty-one thousand, four hundred one".