646020143631531 has 16 divisors (see below), whose sum is σ = 971351459747200. Its totient is φ = 424252034622504.

The previous prime is 646020143631491. The next prime is 646020143631553. The reversal of 646020143631531 is 135136341020646.

646020143631531 is a `hidden beast` number, since 6 + 4 + 6 + 0 + 2 + 0 + 1 + 4 + 3 + 631 + 5 + 3 + 1 = 666.

646020143631531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646020143631531 - 2⁹ = 646020143631019 is a prime.

It is a super-2 number, since 2×646020143631531² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646020143631581) 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, 178557251821 + ... + 178557255438.

It is an arithmetic number, because the mean of its divisors is an integer number (60709466234200).

Almost surely, 2^{646020143631531} is an apocalyptic number.

646020143631531 is a deficient number, since it is larger than the sum of its proper divisors (325331316115669).

646020143631531 is a wasteful number, since it uses less digits than its factorization.

646020143631531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357114507335 (or 357114507329 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 646020143631531 in words is "six hundred forty-six trillion, twenty billion, one hundred forty-three million, six hundred thirty-one thousand, five hundred thirty-one".