1566666550 has 24 divisors (see below), whose sum is σ = 2942860752. Its totient is φ = 620460000.

The previous prime is 1566666547. The next prime is 1566666571. The reversal of 1566666550 is 556666651.

It is a self number, because there is not a number n which added to its sum of digits gives 1566666550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150066 + ... + 160165.

It is an arithmetic number, because the mean of its divisors is an integer number (122619198).

Almost surely, 2^1566666550 is an apocalyptic number.

1566666550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1566666550 is a deficient number, since it is larger than the sum of its proper divisors (1376194202).

1566666550 is a wasteful number, since it uses less digits than its factorization.

1566666550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310344 (or 310339 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 1566666550 is about 39581.1388163605. The cubic root of 1566666550 is about 1161.4277282575.

It can be divided in two parts, 156666 and 6550, that added together give a square (163216 = 404²).

The spelling of 1566666550 in words is "one billion, five hundred sixty-six million, six hundred sixty-six thousand, five hundred fifty".