1662521440 has 48 divisors (see below), whose sum is σ = 3958682112. Its totient is φ = 659764224.

The previous prime is 1662521431. The next prime is 1662521447. The reversal of 1662521440 is 441252661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662521447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20589 + ... + 61228.

It is an arithmetic number, because the mean of its divisors is an integer number (82472544).

Almost surely, 2^1662521440 is an apocalyptic number.

1662521440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662521440 is an abundant number, since it is smaller than the sum of its proper divisors (2296160672).

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

1662521440 is a wasteful number, since it uses less digits than its factorization.

1662521440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81959 (or 81951 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1662521440 is about 40774.0289890514. The cubic root of 1662521440 is about 1184.6473435337.

The spelling of 1662521440 in words is "one billion, six hundred sixty-two million, five hundred twenty-one thousand, four hundred forty".