1587587215661 has 2 divisors, whose sum is σ = 1587587215662. Its totient is φ = 1587587215660.

The previous prime is 1587587215657. The next prime is 1587587215717. The reversal of 1587587215661 is 1665127857851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1580881243561 + 6705972100 = 1257331^2 + 81890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1587587215661 - 2² = 1587587215657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1587587215594 and 1587587215603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1587587215961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 793793607830 + 793793607831.

It is an arithmetic number, because the mean of its divisors is an integer number (793793607831).

Almost surely, 2^{1587587215661} is an apocalyptic number.

It is an amenable number.

1587587215661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1587587215661 is an equidigital number, since it uses as much as digits as its factorization.

1587587215661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224000, while the sum is 62.

The spelling of 1587587215661 in words is "one trillion, five hundred eighty-seven billion, five hundred eighty-seven million, two hundred fifteen thousand, six hundred sixty-one".