1021666070587 has 8 divisors (see below), whose sum is σ = 1056942266400. Its totient is φ = 986392963584.

The previous prime is 1021666070497. The next prime is 1021666070599. The reversal of 1021666070587 is 7850706661201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021666070587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021666070587.

It is not an unprimeable number, because it can be changed into a prime (1021666070387) 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, 88998 + ... + 1432219.

It is an arithmetic number, because the mean of its divisors is an integer number (132117783300).

Almost surely, 2^{1021666070587} is an apocalyptic number.

1021666070587 is a deficient number, since it is larger than the sum of its proper divisors (35276195813).

1021666070587 is a wasteful number, since it uses less digits than its factorization.

1021666070587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544405.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 1021666070587 in words is "one trillion, twenty-one billion, six hundred sixty-six million, seventy thousand, five hundred eighty-seven".