1645520280432 has 80 divisors (see below), whose sum is σ = 4858346998272. Its totient is φ = 470134690560.

The previous prime is 1645520280413. The next prime is 1645520280487. The reversal of 1645520280432 is 2340820255461.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17750682 + ... + 17843142.

Almost surely, 2^{1645520280432} is an apocalyptic number.

1645520280432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645520280432 is an abundant number, since it is smaller than the sum of its proper divisors (3212826717840).

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

1645520280432 is a wasteful number, since it uses less digits than its factorization.

1645520280432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145446 (or 145440 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The spelling of 1645520280432 in words is "one trillion, six hundred forty-five billion, five hundred twenty million, two hundred eighty thousand, four hundred thirty-two".