645612129240 has 128 divisors (see below), whose sum is σ = 2086404868800. Its totient is φ = 158875637760.

The previous prime is 645612129229. The next prime is 645612129247. The reversal of 645612129240 is 42921216546.

It is a junction number, because it is equal to n+sod(n) for n = 645612129192 and 645612129201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645612129247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5730250 + ... + 5841830.

Almost surely, 2^645612129240 is an apocalyptic number.

645612129240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645612129240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043202434400).

645612129240 is an abundant number, since it is smaller than the sum of its proper divisors (1440792739560).

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

645612129240 is a wasteful number, since it uses less digits than its factorization.

645612129240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115317 (or 115313 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 645612129240 in words is "six hundred forty-five billion, six hundred twelve million, one hundred twenty-nine thousand, two hundred forty".