1662521353460 has 96 divisors (see below), whose sum is σ = 3868637480064. Its totient is φ = 595106240000.

The previous prime is 1662521353411. The next prime is 1662521353463. The reversal of 1662521353460 is 643531252661.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662521353463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3627815 + ... + 4060305.

It is an arithmetic number, because the mean of its divisors is an integer number (40298307084).

Almost surely, 2^{1662521353460} is an apocalyptic number.

1662521353460 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 1662521353460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1934318740032).

1662521353460 is an abundant number, since it is smaller than the sum of its proper divisors (2206116126604).

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

1662521353460 is a wasteful number, since it uses less digits than its factorization.

1662521353460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432785 (or 432783 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 1662521353460 in words is "one trillion, six hundred sixty-two billion, five hundred twenty-one million, three hundred fifty-three thousand, four hundred sixty".