4545878321520 has 320 divisors, whose sum is σ = 16306701840000. Its totient is φ = 1162575396864.

The previous prime is 4545878321513. The next prime is 4545878321599. The reversal of 4545878321520 is 251238785454.

It is a happy number.

4545878321520 is a `hidden beast` number, since 4 + 5 + 4 + 5 + 87 + 8 + 32 + 1 + 520 = 666.

It is a super-2 number, since 2×4545878321520² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9089832 + ... + 9576888.

It is an arithmetic number, because the mean of its divisors is an integer number (50958443250).

Almost surely, 2^{4545878321520} is an apocalyptic number.

4545878321520 is a gapful number since it is divisible by the number (40) 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 4545878321520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8153350920000).

4545878321520 is an abundant number, since it is smaller than the sum of its proper divisors (11760823518480).

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

4545878321520 is a wasteful number, since it uses less digits than its factorization.

4545878321520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487257 (or 487245 counting only the distinct ones).

The product of its (nonzero) digits is 10752000, while the sum is 54.

The spelling of 4545878321520 in words is "four trillion, five hundred forty-five billion, eight hundred seventy-eight million, three hundred twenty-one thousand, five hundred twenty".