1645432320156 has 24 divisors (see below), whose sum is σ = 3943108083600. Its totient is φ = 533653725312.

The previous prime is 1645432320139. The next prime is 1645432320163. The reversal of 1645432320156 is 6510232345461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1852963881 + ... + 1852964768.

It is an arithmetic number, because the mean of its divisors is an integer number (164296170150).

Almost surely, 2^{1645432320156} is an apocalyptic number.

It is an amenable number.

1645432320156 is an abundant number, since it is smaller than the sum of its proper divisors (2297675763444).

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

1645432320156 is a wasteful number, since it uses less digits than its factorization.

1645432320156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705928693 (or 3705928691 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 1645432320156 in words is "one trillion, six hundred forty-five billion, four hundred thirty-two million, three hundred twenty thousand, one hundred fifty-six".