646154142240 has 48 divisors (see below), whose sum is σ = 2035385549568. Its totient is φ = 172307771136.

The previous prime is 646154142239. The next prime is 646154142253. The reversal of 646154142240 is 42241451646.

It is a tau number, because it is divible by the number of its divisors (48).

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, 673076752 + ... + 673077711.

It is an arithmetic number, because the mean of its divisors is an integer number (42403865616).

Almost surely, 2^646154142240 is an apocalyptic number.

646154142240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646154142240 is an abundant number, since it is smaller than the sum of its proper divisors (1389231407328).

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

646154142240 is a wasteful number, since it uses less digits than its factorization.

646154142240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346154481 (or 1346154473 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

Adding to 646154142240 its reverse (42241451646), we get a palindrome (688395593886).

The spelling of 646154142240 in words is "six hundred forty-six billion, one hundred fifty-four million, one hundred forty-two thousand, two hundred forty".