1501965421866 has 384 divisors, whose sum is σ = 4204909363200. Its totient is φ = 391261508352.

The previous prime is 1501965421843. The next prime is 1501965421883. The reversal of 1501965421866 is 6681245691051.

It is a happy number.

1501965421866 is a `hidden beast` number, since 1 + 5 + 0 + 1 + 96 + 542 + 1 + 8 + 6 + 6 = 666.

It is a super-2 number, since 2×1501965421866² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1381752375 + ... + 1381753461.

It is an arithmetic number, because the mean of its divisors is an integer number (10950284800).

Almost surely, 2^{1501965421866} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1501965421866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2102454681600).

1501965421866 is an abundant number, since it is smaller than the sum of its proper divisors (2702943941334).

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

1501965421866 is a wasteful number, since it uses less digits than its factorization.

1501965421866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480 (or 1468 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 1501965421866 in words is "one trillion, five hundred one billion, nine hundred sixty-five million, four hundred twenty-one thousand, eight hundred sixty-six".