1361521668 has 48 divisors (see below), whose sum is σ = 3432524480. Its totient is φ = 417550464.

The previous prime is 1361521633. The next prime is 1361521691. The reversal of 1361521668 is 8661251631.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33678 + ... + 62106.

Almost surely, 2^1361521668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1361521668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1716262240).

1361521668 is an abundant number, since it is smaller than the sum of its proper divisors (2071002812).

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

1361521668 is a wasteful number, since it uses less digits than its factorization.

1361521668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28756 (or 28754 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 1361521668 is about 36898.8030700184. The cubic root of 1361521668 is about 1108.3447091351.

The spelling of 1361521668 in words is "one billion, three hundred sixty-one million, five hundred twenty-one thousand, six hundred sixty-eight".