1523145243440 has 20 divisors (see below), whose sum is σ = 3541312691184. Its totient is φ = 609258097344.

The previous prime is 1523145243427. The next prime is 1523145243443. The reversal of 1523145243440 is 443425413251.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1523145243440² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1523145243394 and 1523145243403.

It is not an unprimeable number, because it can be changed into a prime (1523145243443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9519657692 + ... + 9519657851.

Almost surely, 2^{1523145243440} is an apocalyptic number.

1523145243440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1523145243440 is an abundant number, since it is smaller than the sum of its proper divisors (2018167447744).

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

1523145243440 is a wasteful number, since it uses less digits than its factorization.

1523145243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19039315556 (or 19039315550 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 1523145243440 in words is "one trillion, five hundred twenty-three billion, one hundred forty-five million, two hundred forty-three thousand, four hundred forty".