15402161563440 has 80 divisors (see below), whose sum is σ = 47844743716608. Its totient is φ = 4098809288448.

The previous prime is 15402161563421. The next prime is 15402161563447. The reversal of 15402161563440 is 4436516120451.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 15402161563392 and 15402161563401.

It is not an unprimeable number, because it can be changed into a prime (15402161563447) 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, 65771902 + ... + 66005661.

Almost surely, 2^{15402161563440} is an apocalyptic number.

15402161563440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15402161563440 is an abundant number, since it is smaller than the sum of its proper divisors (32442582153168).

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

15402161563440 is a wasteful number, since it uses less digits than its factorization.

15402161563440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131778066 (or 131778060 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

Adding to 15402161563440 its reverse (4436516120451), we get a palindrome (19838677683891).

The spelling of 15402161563440 in words is "fifteen trillion, four hundred two billion, one hundred sixty-one million, five hundred sixty-three thousand, four hundred forty".