1521788401950 has 96 divisors (see below), whose sum is σ = 3898747607040. Its totient is φ = 392420265600.

The previous prime is 1521788401943. The next prime is 1521788401963. The reversal of 1521788401950 is 591048871251.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1521788401893 and 1521788401902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6009292 + ... + 6257408.

It is an arithmetic number, because the mean of its divisors is an integer number (40611954240).

Almost surely, 2^{1521788401950} is an apocalyptic number.

1521788401950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1521788401950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1949373803520).

1521788401950 is an abundant number, since it is smaller than the sum of its proper divisors (2376959205090).

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

1521788401950 is a wasteful number, since it uses less digits than its factorization.

1521788401950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249482 (or 249477 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 51.

The spelling of 1521788401950 in words is "one trillion, five hundred twenty-one billion, seven hundred eighty-eight million, four hundred one thousand, nine hundred fifty".