1566243740 has 12 divisors (see below), whose sum is σ = 3289111896. Its totient is φ = 626497488.

The previous prime is 1566243737. The next prime is 1566243743. The reversal of 1566243740 is 473426651.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1566243737) and next prime (1566243743).

It is a junction number, because it is equal to n+sod(n) for n = 1566243694 and 1566243703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566243743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39156074 + ... + 39156113.

It is an arithmetic number, because the mean of its divisors is an integer number (274092658).

Almost surely, 2^1566243740 is an apocalyptic number.

1566243740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566243740 is an abundant number, since it is smaller than the sum of its proper divisors (1722868156).

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

1566243740 is a wasteful number, since it uses less digits than its factorization.

1566243740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78312196 (or 78312194 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 1566243740 is about 39575.7974019476. The cubic root of 1566243740 is about 1161.3232373050.

The spelling of 1566243740 in words is "one billion, five hundred sixty-six million, two hundred forty-three thousand, seven hundred forty".