1921425501960 has 256 divisors, whose sum is σ = 6426604800000. Its totient is φ = 510635204352.

The previous prime is 1921425501949. The next prime is 1921425501979. The reversal of 1921425501960 is 691055241291.

1921425501960 is a `hidden beast` number, since 1 + 9 + 2 + 1 + 4 + 2 + 550 + 1 + 96 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 426318027 + ... + 426322533.

It is an arithmetic number, because the mean of its divisors is an integer number (25103925000).

Almost surely, 2^{1921425501960} is an apocalyptic number.

1921425501960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921425501960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3213302400000).

1921425501960 is an abundant number, since it is smaller than the sum of its proper divisors (4505179298040).

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

1921425501960 is a wasteful number, since it uses less digits than its factorization.

1921425501960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5785 (or 5775 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 1921425501960 in words is "one trillion, nine hundred twenty-one billion, four hundred twenty-five million, five hundred one thousand, nine hundred sixty".