646261200101 has 16 divisors (see below), whose sum is σ = 729769098240. Its totient is φ = 566904233280.

The previous prime is 646261200089. The next prime is 646261200107. The reversal of 646261200101 is 101002162646.

646261200101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-646261200101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646261200107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96581 + ... + 1140986.

It is an arithmetic number, because the mean of its divisors is an integer number (45610568640).

Almost surely, 2^646261200101 is an apocalyptic number.

It is an amenable number.

646261200101 is a deficient number, since it is larger than the sum of its proper divisors (83507898139).

646261200101 is a wasteful number, since it uses less digits than its factorization.

646261200101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239244.

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

Adding to 646261200101 its reverse (101002162646), we get a palindrome (747263362747).

The spelling of 646261200101 in words is "six hundred forty-six billion, two hundred sixty-one million, two hundred thousand, one hundred one".