1659278001631 has 2 divisors, whose sum is σ = 1659278001632. Its totient is φ = 1659278001630.

The previous prime is 1659278001547. The next prime is 1659278001713. The reversal of 1659278001631 is 1361008729561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1659278001631 - 2²¹ = 1659275904479 is a prime.

It is a super-2 number, since 2×1659278001631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1659278001131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829639000815 + 829639000816.

It is an arithmetic number, because the mean of its divisors is an integer number (829639000816).

Almost surely, 2^{1659278001631} is an apocalyptic number.

1659278001631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659278001631 is an equidigital number, since it uses as much as digits as its factorization.

1659278001631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 1659278001631 in words is "one trillion, six hundred fifty-nine billion, two hundred seventy-eight million, one thousand, six hundred thirty-one".