1556379414820 has 12 divisors (see below), whose sum is σ = 3268396771164. Its totient is φ = 622551765920.

The previous prime is 1556379414781. The next prime is 1556379414823. The reversal of 1556379414820 is 284149736551.

It can be written as a sum of positive squares in 2 ways, for example, as 592444247616 + 963935167204 = 769704^2 + 981802^2 .

It is not an unprimeable number, because it can be changed into a prime (1556379414823) 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, 38909485351 + ... + 38909485390.

It is an arithmetic number, because the mean of its divisors is an integer number (272366397597).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1556379414820 = 3112758829640, but 3⋅1556379414820 = 4669138244460 is not.

Almost surely, 2^{1556379414820} is an apocalyptic number.

1556379414820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1556379414820 is an abundant number, since it is smaller than the sum of its proper divisors (1712017356344).

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

1556379414820 is a wasteful number, since it uses less digits than its factorization.

1556379414820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77818970750 (or 77818970748 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 1556379414820 in words is "one trillion, five hundred fifty-six billion, three hundred seventy-nine million, four hundred fourteen thousand, eight hundred twenty".