1644156530420 has 48 divisors (see below), whose sum is σ = 3648453096960. Its totient is φ = 621105678336.

The previous prime is 1644156530413. The next prime is 1644156530477. The reversal of 1644156530420 is 240356514461.

It is a super-3 number, since 3×1644156530420³ (a number of 38 digits) contains 333 as substring.

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, 22585517 + ... + 22658196.

It is an arithmetic number, because the mean of its divisors is an integer number (76009439520).

Almost surely, 2^{1644156530420} is an apocalyptic number.

1644156530420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1644156530420 is an abundant number, since it is smaller than the sum of its proper divisors (2004296566540).

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

1644156530420 is a wasteful number, since it uses less digits than its factorization.

1644156530420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45243824 (or 45243822 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 1644156530420 in words is "one trillion, six hundred forty-four billion, one hundred fifty-six million, five hundred thirty thousand, four hundred twenty".