1215553545040 has 40 divisors (see below), whose sum is σ = 2895092780328. Its totient is φ = 474362357760.

The previous prime is 1215553545029. The next prime is 1215553545043. The reversal of 1215553545040 is 405453555121.

It can be written as a sum of positive squares in 4 ways, for example, as 19925016336 + 1195628528704 = 141156^2 + 1093448^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1215553545040² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1215553544984 and 1215553545002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215553545043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185294517 + ... + 185301076.

Almost surely, 2^{1215553545040} is an apocalyptic number.

1215553545040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215553545040 is an abundant number, since it is smaller than the sum of its proper divisors (1679539235288).

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

1215553545040 is a wasteful number, since it uses less digits than its factorization.

1215553545040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370595647 (or 370595641 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 40.

The spelling of 1215553545040 in words is "one trillion, two hundred fifteen billion, five hundred fifty-three million, five hundred forty-five thousand, forty".