1581366870 has 48 divisors (see below), whose sum is σ = 4117334832. Its totient is φ = 421104960.

The previous prime is 1581366859. The next prime is 1581366887. The reversal of 1581366870 is 786631851.

1581366870 is a `hidden beast` number, since 1 + 581 + 3 + 6 + 68 + 7 + 0 = 666.

It is a hoax number, since the sum of its digits (45) 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 (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53985 + ... + 77955.

It is an arithmetic number, because the mean of its divisors is an integer number (85777809).

Almost surely, 2^1581366870 is an apocalyptic number.

1581366870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1581366870 is an abundant number, since it is smaller than the sum of its proper divisors (2535967962).

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

1581366870 is a wasteful number, since it uses less digits than its factorization.

1581366870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24717 (or 24714 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1581366870 is about 39766.4037851048. The cubic root of 1581366870 is about 1165.0490551406.

The spelling of 1581366870 in words is "one billion, five hundred eighty-one million, three hundred sixty-six thousand, eight hundred seventy".