1566498640 has 60 divisors (see below), whose sum is σ = 4236750036. Its totient is φ = 537083904.

The previous prime is 1566498629. The next prime is 1566498641. The reversal of 1566498640 is 468946651.

It can be written as a sum of positive squares in 2 ways, for example, as 793436224 + 773062416 = 28168^2 + 27804^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566498641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195889 + ... + 203728.

Almost surely, 2^1566498640 is an apocalyptic number.

1566498640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566498640 is an abundant number, since it is smaller than the sum of its proper divisors (2670251396).

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

1566498640 is a wasteful number, since it uses less digits than its factorization.

1566498640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399644 (or 399631 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 1566498640 is about 39579.0176735098. The cubic root of 1566498640 is about 1161.3862341486.

The spelling of 1566498640 in words is "one billion, five hundred sixty-six million, four hundred ninety-eight thousand, six hundred forty".